My friend removed these 10 years ago and now not certain where he removed them from. It is 68 camaro conv. Any help would be great. thank you.

 

I could not find those anywhere on my '68. Unless that frame work is an option that my car does not have. They almost look like some type of subframe brackets for suspension or drive train...?. Seems to have a pocket that another part slips in or some type of strap and bolts to the frame. I really don't think this is from a Camaro, a '68 at least.