The G508 and G506 and G503 use this stuff in a few places (hood to cowl and hood to radiator, respectively)
So if your is looking ratty, this is what you want. Measure and install.
http://stores.restorationspecialties.co ... gories.bok (lower price)
http://www.classychevusa.com/index.cfm/ ... rd1557.htm (is also on ebay)