{
  "classification": "Supplier-photo-ruler comparison and estimated external casing; no owner dimensions.",
  "factory_sources": [
    "https://www.spridgets.de/downloads/Parts-1977.pdf#page=146",
    "https://www.spridgets.de/downloads/Parts-1977.pdf#page=147"
  ],
  "comparison_source": "https://classiccarparts.co.nz/Morris-Minor-Parts/gasket-differential-case-flange-gasket.-mg-midget%2C-morris-minor-and-austin-healey-sprite.-dif107-2a7027?limit=100&order=ASC&sort=rating",
  "comparison_images": [
    "https://classiccarparts.co.nz/image/cache/catalog/products_2020/2A7027__1_-1000x1000.jpg",
    "https://classiccarparts.co.nz/image/cache/catalog/products_2020/2A7027__2_-1000x1000.jpg"
  ],
  "photo_ruler_observations": [
    {
      "image": 1,
      "metric_marks_mm": [
        50,
        200
      ],
      "source_pixels": [
        [
          326,
          579
        ],
        [
          903,
          417
        ]
      ],
      "approx_outer_image_bounds_xy": [
        [
          110,
          84
        ],
        [
          910,
          910
        ]
      ],
      "limitations": "Oblique ruler and gasket, hand-held edge, perspective and ruler/part coplanarity uncertain."
    },
    {
      "image": 2,
      "metric_marks_mm": [
        10,
        50
      ],
      "source_pixels": [
        [
          829,
          236
        ],
        [
          969,
          237
        ]
      ],
      "approx_outer_image_bounds_xy": [
        [
          128,
          120
        ],
        [
          875,
          838
        ]
      ],
      "limitations": "Short ruler span gives weaker scale; gasket/scale planes and perspective uncertain."
    }
  ],
  "interpretation": "Outer-span estimates are approximately200\u2013215mm across the two photographs. These are broad comparison estimates, not measured replacement dimensions. The former340mm gasket/carrier diameter is substantially larger than both comparisons.",
  "selected_reference_mm": {
    "gasket_outer_diameter": 210,
    "gasket_inner_diameter": 175,
    "estimated_fixing_pcd": 188,
    "hole_diameter_comparison": 8.4,
    "bowl_radial_radius": 118,
    "bowl_axial_radius": 110,
    "inner_bowl_radial_radius": 112,
    "inner_bowl_axial_radius": 104,
    "front_bowl_cut_z": 65,
    "gasket_rear_z": 83,
    "gasket_thickness": 0.5,
    "carrier_rear_z": 83.5,
    "carrier_thickness": 8,
    "carrier_cone_outer_radii": [
      95,
      45
    ],
    "carrier_cone_z": [
      91.5,
      250
    ]
  },
  "retained": "Axle center/body pose, tube-end planes, tube and halfshaft passages, rebound pins, hub/drum/wheel/track references, gasket/carrier axial joint planes, pinion bearing pockets, flange/seal source geometry and propshaft mating plane. Independent internal comparisons keep their dimensions and stations.",
  "historical_comparison": "Complete old large carrier with its saddles/arms/web is separately selectable and hidden until selected. It is retained at its original size/pose, not scaled into the new shell. The old260mm crown-wheel envelope is also an optional unfit comparison; its size remains unchanged and source conflicts are recorded.",
  "limits": "No fitted axle identity, actual casing/gasket dimensions, loaded shape, crown-wheel diameter/ratio, gear mesh, wall gauge, stud thread, clocking, bearing support/preload, sealing, operating clearance or removal path is established. Bowl shape/depth/walls, flange bore/PCD, conical carrier, four rib sections and transitions remain estimates. Internal bearing/cage/crown/pinion comparisons are not validated by the new outer shell; contacts are source conflicts, not actual-car interferences. No internal part or surrounding obstacle is moved or reduced to erase contacts. Factory parts roles are distinct from the supplier ruler interpretation and from the actual car."
}