brake rotor compatibility

[Dave C.]

Joel asks....
"Ok guys, got a parts question.  I have some Zimmerman rotors for my '86 
5kcstq, and I was wondering if they would fit on my '90 V8q.  I don't have
part 
numbers for either, but figuring that the rear of the quattros didn't seem to 
change that much, so I was going to guess that they would.  Someone please
let me know otherwise."

Joel,
Are you referring to rear rotors?

No ... they will not work on the V8 ... V8 has vented rear rotors, 5ktq is
not vented.

One of my favorite tools for answering a question like this is the database
provided on-line by Rod at The Parts Connection 
http://www.thepartsconnection.com/
You can log on anytime and check which cars use the same part number, etc.
Dave C.