I hate to break this to you all, but the neoprene rubber ones have been discontinued. I can't find them ANYwhere. If anyone has any leads, please let me know! NAPA online shows them, but then it comes back as discontinued. Doesnt make me feel any better what Jon said about RockAuto either!
Rock Auto shows one left...$11.26 FelPro. You have to search in 1958 BelAir (235 engine) to find it. Here is a link. If it is gone by the time you get there, let me know and we'll see what we can do.
Jon
link:
https://www.rockauto.com/catalog/raframecatalog.php