Which rear main seal do I need for my Pontiac?

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TIP-RM300
For 3” Main blocks
301, 326, 350, 389, 400 cid
Sealing surface approx. 3.188”
Purple in color
Buy here: https://www.tinindianperformance.com/product/pontiac-rear-main-seal-3-inch/

TIP-RM325
for 3.25” main blocks
421, 428, 455 cid
Sealing Surface approx. 3.436”
Black in color
Buy here: https://www.tinindianperformance.com/product/pontiac-rear-main-seal-325-inch/

We also sell rear seal kits that come with sealer:
https://www.tinindianperformance.com/product-category/pontiac-gaskets-and-seals/rear-main-seals/

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