There are 30 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
CENTURY
- cut-out cover
  - 10x10-3/4
    - 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
- round cover

Ring Gear and Pinion for 1977 Buick Century

Fits: CENTURY cut-out cover 10x10-3/4 2.56 ratio (change)

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