1970 Camaro Rear Bumper Guard

[CamarosRus]

www.amkproducts.com has similar if not the same 1/4"X 1" Bolt. I have seen a different head marking than Jack's above picture....so long as some G.M. headmark would be OK!
WELLNUT is/was brand of Valance nut of which AMK has on page 70 of catalog, but not sure if O.E.M. Washer useage appears to have been improvised at factory, as not captured or anything special

[Charley Lillard]

They are 1/4" and not 5/16"s ?

[70-SS/RS-L78]

47Hammer; Nice looking Car.

[47Hammer]

Chuck, Charley, Thanks for the info.
Mark, Thanks for looking, still working on it.

[GeorgeLyons]

No self tapping bolts used, rear valance has a 1/4-20 (coarse) Nutsert on my car. I have seen cars with and without a black plastic or hard rubber washer against the paint. Unsure about this detail but no self tappers I'm quite positive.

[47Hammer]

So what do ya do, drill the valance? It looks like you can't get a nut behind the panel.(talk about a nut behind the wheel) I was told by a guy that ownes a few second gen cars that he uses self tapping. No wonder every other '70 or second gen Camaro has no rear bumper brackets... I really don't want in to be a mickey mouse deal. What a pain in the backside this has become. Thanks for the comments guys.

[Hotrodpaul]

I believe on the assembly line the workers would mark and drill the rear valence with a 33/64" drill (Slightly larger than 1/2") and then slip in the Wellnut rubber thread inserts. The nutserts have a bronze 1/4UNC thread insert molded inside and are shouldered. Once the bolt is inserted and tightened, the rubber swells outward, locking inself to the valence. Great for those blind holes where no wrench can go....

Paul