Technical Help identify please

During my barn clean out I have found 30+ of these and have no clue what they go to. I’m not even sure where to start. My son thinks chevy c10 may be correct
Any help would be great
Thanks

 

Also have a whole bunch of these

 

At first glance I thought the headlight doors were 65-66 Merc? Don't know about the bottom Chrome units- but they're cool- want to sell any?

 

Second part is an aftermarket exhaust tip, clamps to tailpipe, bumper.

 

Very! good price on the tips.

 

I started with nine sets, I now have six left
It appears one set will fit in one of the boxes at usps. Maybe in one of the padded envelopes. I will know tomorrow.