I ran into the same problem. I had a 71 and couldn't find the correct length jack. The later models were too short.
I recently purchased a 72 T/A that was missing the jack. I just purchased an original out of a 72 bird that the owner didn't need. Here is the length..34 1/4 installed there is about 1 inch between the end of the jack and the end of the bracket. There is some movement back and forth but it doesn't come out of the brackets.
Hope it helps
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