This will annoy alot of you.

So I got a 8 1/4 rear end. The seller said it came out of his Scamp.
It was an early 70's scamp. Did the 8 1/4 come in scamps before 73 or was it just 8 3/4 or 7 1/4 before 73. Also is there any difference in length of the two rear ends?