67 Sport fury transmission leaking at dipstick

My 67 with a 383 and 727 is leaking at the o"ring I have replaced it and it still leaks. Not immediately but after a couple of weeks. I am not sure if I have the correct dipstick tube or the correct transmission for the Dipstick tube. The dipstick has a tab to bolt onto the transmission but the transmission des not have a corresponding bolt boss.
I saw in another thread that 66 's took a dipstick with the bolt and that later 727's did not have this. so eitther sometime in the last 55...

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Author: 67 ragtop