Mystery Part '65 Barracuda

Thanks all. I took the car apart 13 years ago and this one had me scratching my head. I found the illustration in the parts book on page 9-26. On page 9-48, it just specifies for 273 Dart, Valiant, "Engine rear support insulator". No mention of trans type.

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It's 9-71-15 in your illustration. It might be kind of a pain to get in if the transmission is in place. Maybe an offset phillips will get in there.....