I've got a set in the garage for a 8 3/4. I think they're 11"x2", but I'd have to measure again to be sure. Backing plates, new shoes, new hardware, and good drums. PM me if you're interested.
-Jon
I bought mine from www.brewersperformance.com. I took it off awhile back, but I'm pretty sure I sold it. They sell all the 4 speed parts you could ever hope to want. I've had good experiences with them.
-Jon