For a 70 442, does anyone have a pic of what the correct radiator support clamp to radiator top plate fastener should look like? I've seen countless variations used for this.

 

ttt - if no pic, just a description of head type and thread pitch, length and color.

 

Not the best pics, but these 5/16-18 flange headed style bolts are what is typically found on the core support area from the factory.
IMG_0917.jpg

IMG_0928.jpg

 

Rocket Vapor, thanks but the one fastener I'm looking for is the one that holds that plastic clamp (that goes around the upper radiator hose) to the radiator support/fan shroud.
BTW - that's a cool pic of your car in your signature

 

Opps I should of be paying more attention in class!

I have not parted as many cars as some here, but I have found that some of the smaller less critical general hardware (small sheet metal screws, ect.) varies greatly as to what was available at the time of assembly.

The black plastic support clamp for the upper radiator hose that I have seen are attached using anything from a black oxide plated hex head with a captured washer screw, to a clear zinc plated flanged hex head screw, and even a clear zinc plated pan head Phillips screw.

GM does have specs for their fasteners, but are sometimes very liberal or substituded in lesser critical areas.

With this said there maybe no concrete answer here, but we will see what others say.

At the very least you got a free thread bump!!!