This is not mine, but I know the Panel/Suburban guys have been looking for factory rear bumpers and I thought someone might find this useful.

http://cgi.ebay.com/ebaymotors/64-65-66-1966-Chevy-Suburban-or-Panel-Truck-Rear-Bumper_W0QQcmdZViewItemQQcategoryZ33640QQihZ018QQitemZ280292320461QQrdZ1QQsspagenameZWDVW