More 7-1/4" Madness

OK, I've got my 75 Valiant Custom with the blown up Diff, and, I've got my 76 Valiant Base model (Very Base) parts car with a smashed front, and, a good diff.

Here's the problem.......

75 Valiant has 7-1/4" rear, 10 inch brakes, 5x4.5 bolt circle and, 5 stud bearing retainer.

76 Valiant has 7-1/4" rear, 9 inch brakes, 5x4 bolt circle, and, 4 stud bearing retainer.

How can I make this work, getting the 10 inch brakes and 5x4.5 bolt circle axles in the 4 stud diff???

5x4.5 axles have bigger bearings (both OD and ID) than the 5x4s....