There are 16 choices

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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
  - 2.41 ratio
  - 2.56 ratio
  - 2.73 thru 3.42 ratios

Ring Gear and Pinion for 1977 Buick Estate Wagon

Fits: round cover 11x10-11/2 2.73 thru 3.42 ratios (change)

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