Question about the 7 1/4 rear end.

I want to replace my spider gear set also. So far I haven't had luck finding the correct gears. Chrysler had two versions of 7 1/4. A early version with a 9 bolt cover. Late is 10 bolt cover. Yours and mine are 9 bolt. The two set I ordered where incorrect.

No one seems to want to answer this question. Were you able to find the correct ones? I'm looking at Motive Gear C7.25BI for my 63 GT. I have the 9 bolt cover as well. Thanks.