ZL1/Z28 Hubs - 25954415 (ACDelco RW20-119)
http://www.camaro5.com/forums/showth...=434445&page=2
look at post # 28
I found new ones on ebay from rolling automotive for $50ea! heck of a deal
they seem to be sold out at the moment, contact them to see if they'll get some more in.
EDIT: pics and discussion here
http://www.camaro5.com/forums/showpo...&postcount=150