The thing is the 8 3/4 is probably more abundant than the 9", 75% of the 9" rears were in trucks with the 5 1/2" bolt cir or in land yachts which most of them were coil spring and way too wide to use in anything without cutting it down and a lot of them had 5" bolt cir. The 9" rears in cars with 4 1/2" bolt cir are far and few between, most were 8" unless it was a muscle car like a big block Mustang or Cougar. Aftermarket 9" parts and third members may be more abundant but not complete usable 9" rears.
