I'm assuming you're talking about bucket seats. The GTO seat foam in 1964 would be the same for the LeMans and the Tempest too. The Tempest was smaller from 61 to 64 , and the first GTO in 64 was an option package on the same platform as the Tempest . The 65 GTO was bigger, as was the Tempest and LeMans, but only by 3 inches or so. My guess is that 64 through 67 were the same seats underneath for the Tempest, LeMans, and the GTO.
After doing some checking, the same seat foam, besides being in the three Pontiac models, would be in the Buick Skylark, Chevy II, Chevy Malibu, Chevelle, and Chevy El Camino for 1964. Also the Chevy Impala for 1965.
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Last edited by DanTwoLakes; 02-22-2012 at 08:01 PM.