Quote:
Originally Posted by Kenth
From 1967 Pontiac Chassis Parts Catalog:
Bolt A #538946, 3/8" - 24 x 1/2" - 13 x 5 5/8"
Bolt B #518031, 1/2" - 13 x 4 5/8"
HTH
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The bolts must be the same length since the head of the bolt sits on the same height from the block.