There are 27 choices

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BUICK
- cut-out cover
  - 10x10-3/4
  - 9-1/2x10-1/4
- round cover
  - 10-1/4x9-1/2
    - 2.14 thru 3.08 ratios
    - 3.23 thru 4.11 ratios
  - 11x10-11/2
RIVIERA
- 10x10-3/4 cover
  - 2.28 ratio
  - 2.41 ratio
  - 2.56 ratio
  - 2.73 ratio
  - 2.93 ratio
  - 3.08 ratio
  - 3.23 ratio
  - 3.42 ratio
- 9-1/2x10-1/4 cover

Ring Gear and Pinion for 1978 Buick Riviera

Fits: RIVIERA 10x10-3/4 cover 3.23 ratio (change)

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