How to locate the finger guard on the core support.
In this photo you see the reference points to use. The repop core support has hidden holes to facilitate this. They are on the top, rear edge .... if you look underneath you will see square punched holes ... that is where GM would have located the square weld nuts on an OEM support. They have to be drilled out on the top side to install 5/16 - 18 rivet nuts, or to accommodate whatever fastener you plan on using (the factory use 5/16-18 machine screws). In this photo you see the hole locations on the repop support and the matching holes on the metal finger guard. (I know they look too far apart ... caused by wide angle lens)
This is what the hole in the repop support look like when drilled out on the top side.
Installing 5/16-18 rivet nuts in the repop support.
5/16-18 screw installed in the repop support.
Finger guard installed using the two reference bolt holes. The additional holes will also need to be drilled out using the finger guard as a template ... you can't see it, but these locations in the repop support also have square holes in the lower layer of metal ... this repop is a mish-mash of 68 and later design features.
Carefully mark the locations and drill for 5/16-18 rivet nuts. They all should be pretty close to the correct location ... a couple of mine did not line up perfectly with the preexisting square holes underneath .... but not enough to cause a problem.
Bear in mind, when using rivet nuts, lubricate the screws that will be installed. You do not want them seizing in the nut and trying to twist it out of the sheet metal. I will be tack welding the nuts on the bottom side when all the test fitting is done to prevent this. When installed properly they function quite well ... but if a screw seizes in them, and they turn in the sheet metal it can be a real pain getting the screw out.
