NAPA/Victor Part No. for the rear gasket is P39130. This will be the heavier gasket material, but not cork. Just went through the same thing with my truck as well. For the 4x4's the catalog has the front and rear gasket parts numbers reversed.
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72 K20 - quote upon getting it home "What did you buy it for if the brakes don't work"
98 Z71, 96 Tacoma + more toys than I can remember
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