{
  "schema": "factory-1975-dimension-audit-v1",
  "date": "2026-10-27",
  "baseline_commit": "16ea90ae",
  "geometry_changed": false,
  "owner_dimensions_applied": false,
  "sources": [
    {
      "bulletin": "75-G-2",
      "url": "https://mgcar.fans/wp-content/TSB/1975/TSB-1975-75-G-2.pdf",
      "pdf_sha256": "659e421e6fcd334b2373f4e455b64fd3f77e9b4367d8eef1fbbff6b996fb4d61"
    },
    {
      "bulletin": "75-F-5",
      "url": "https://mgcar.fans/wp-content/TSB/1975/TSB-1975-75-F-5.pdf",
      "pdf_sha256": "4714daa46da2e45b0f806586c1c716d64b22106472fa87db819152a298388039"
    },
    {
      "bulletin": "76-A-2",
      "url": "https://mgcar.fans/wp-content/TSB/1976/TSB-1976-76-A-2.pdf",
      "pdf_sha256": "7f7ea5355fdb09ce042b148198a1d36575121f1bfa49198ff9aa39207be4eee0"
    }
  ],
  "factory_75_G_2_page_2": {
    "classification": "Original British Leyland 1975 specification table; reference specification, not fitted measurements.",
    "direct_visual_reading": true,
    "dimensions_mm": {
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      "front_track_pressed": 1182.6875,
      "rear_track_pressed": 1143.0,
      "front_track_wire": 1176.3374999999999,
      "rear_track_wire": 1149.35,
      "overall_length": 3581.3999999999996,
      "overall_width_pressed": 1393.8249999999998,
      "overall_width_wire": 1435.1,
      "overall_height": 1225.55,
      "ground_clearance": 82.55
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    "printed_values": {
      "wheelbase": "6 ft 8 in",
      "front_track_pressed": "3 ft 10 9/16 in",
      "rear_track_pressed": "3 ft 9 in",
      "overall_length": "11 ft 9 in",
      "overall_width_pressed": "4 ft 6 7/8 in",
      "overall_height": "4 ft 1/4 in",
      "ground_clearance": "3 1/4 in"
    },
    "configuration_limit": "The page does not state the hood position or detailed loading/measurement convention for overall height or ground clearance. Wheel branches are explicit. Do not equate the parked-hood viewer or its estimated unloaded tyres with a factory measurement condition."
  },
  "runtime": {
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    "selectable_records": 1017,
    "visible_unique_meshes": 1530,
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    "coordinates": "Canonical body mm, recovered from actual THREE matrixWorld; scene display translation Y=-150mm removed.",
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    "estimated_unloaded_tyre_radius_mm": 283.6333333333334,
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      "difference_mm": 0
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    "bumper_to_bumper_length": {
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      "factory_overall_length_mm": 3581.3999999999996,
      "scope": "These bumpers are the visible whole-car Z extrema in this state; rendered/native approximation only."
    },
    "bumper_width": {
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      "factory_pressed_overall_width_mm": 1393.8249999999998,
      "scope": "Bumper width is a component envelope. Current mirror-inclusive door envelope1465.44887mm is larger; the factory table does not identify all inclusion boundaries."
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    "parked_hood_height": {
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      "factory_overall_height_mm": 1225.55,
      "legacy_handbook_transcription_height_mm": 1130.0,
      "scope": "Different/unresolved configuration conventions. Neither1130nor1225.55mm is applied as a fitted parked-hood rescaling target."
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  "exhaust_finding": {
    "classification": "Major estimated common-frame conflict; not actual-car ground clearance or interference.",
    "native_step_bounds_mm": {
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    "native_longitudinal_chamber_above_estimated_analytic_tyre_plane_mm": 16.08666656666334,
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    "historical_context": "Underfloor builder records an estimated93.13mm front bend/coupling lowering to sit below estimated gearbox. That local construction decision did not establish the complete ground/body/engine frame.",
    "action": "Reconcile existing owner underside evidence and original support/pipe datum relationships before a coordinated power-unit/body/exhaust revision. Do not raise only the silencers,shrink tyres,move the ground plane or cut neighbors to force82.55mm.",
    "native_step_sha256": "a9a51134a88bd0dc5266fdee241e63b37617580affd8754118fa4e1370cd07a9"
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    "steering_rack": "75-F-5: from serial158024,rack-assembly-to-crossmember bolts17\u201318lbft;do not overtighten. Fitted serial/fastener mapping unverified;not assigned to cap/pinion screws or a tightening instruction for this car."
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  },
  "limits": "No geometry or existing assembly transform changes. Whole-car mesh extrema are not a surveyed car,loaded tyre state,minimum operating clearance or verified replacement path. The1500front pickup/rail drawing remains unresolved;agreement in wheelbase/tracks/length does not validate internal chassis widths. Existing1130mm and compiled workshop1362.075mm width readings remain separate source entries rather than silently overwritten.",
  "validation": {
    "all_existing_body_register_entries_held": true,
    "all_84_native_mesh_sources_byte_identical_to_baseline": true,
    "underfloor_exhaust_step_byte_identical_to_baseline": true,
    "positive_valid_selected_native_solids": true,
    "geometry_or_existing_transforms_changed": false,
    "browser": {
      "study": {
        "heading": "Original 1975 dimensions and the low exhaust reference",
        "tableRows": 6,
        "pageOverflow": false,
        "sectionWidth": 351,
        "links": [
          "https://mgcar.fans/wp-content/TSB/1975/TSB-1975-75-G-2.pdf#page=2",
          "../body/?part=exhaust-cross-box",
          "../body/?part=front-exhaust-coupling",
          "../cad/factory-1975-dimension-audit.json",
          "#front-frame-datums"
        ]
      },
      "body": {
        "withoutHook": true,
        "nativeSourcesReady": 84,
        "selection": true,
        "sourceErrors": []
      },
      "pageErrors": [],
      "scope": "Evidence/study increment;no geometry changes. Initial fresh-page check retained the previously injected script in browser cache;clearing that cache and repeating proves the current production script has no diagnostic hook."
    }
  }
}