[bouncytruck]

http://www.ClassicHeartbeat.com/
http://www.kingparts.com/
http://www.pickupsnw.com/
http://www.gmcpaulstruckparts.com/index.htm
http://www.mothertruckers.net/
http://truckandcarshop.com/
http://www.chevyduty.com/
http://www.lmctruck.com/

and there are many others... I have seen replacement Blazer side panels in the Pickups NW catalog. I don't remember the price but it was quite expensive. I don't think they are on their online catalog.