http://www.rockauto.com/info/USAStandardGear/USAStandardInstallInstructions.pdf I found this while poking around. I'm not really needing disk on the rear. I just had the big drums so I thought I'd ask if they might fit. If not I'd just stay with the stock ones. Im not even sure if the wheels will fit over the big drums, but iirc the 15" rally wheels came off this wagon too. Good Info though Thanks for posting it.