I'm not much of a Walmart person either, but the hobby shops around me are all gone for some years now. I would buy some kits at WM though. So it's mail order or Hobby Lobby.
Since we're talking tools, I take a paper hole punch, the kind you squeeze, and punch out discs of various grits of sandpaper and glue them to the end of my hobby knives. Good for reaching tight places.
You can strip the parts, remove any seams or flash, then get in touch with Spotlight Hobbies. They can chrome plate parts like most model companies do.
Out of curiosity I got the Canuck front bumper and held it up against the Salvino bumper. The Canuck bumper was about 3/32" wider, which would be easy to section. I couldn't hold it against the body due to the mounting pins on the Canuck part. To
I was wondering that also. You would have to make race modifications to them. I have a 1977 Monte Carlo by Bandit Resin that I grafted a single headlight Canuck conversion piece onto it.
On the Thunderbolts I built, I sprayed the chassis in red primer, then over sprayed the edges body color. Suspension parts black. I seen pictures of a restored Tbolt where everything was satin black, but I don't trust restored cars that much.
That is probably not just a straight repop of a common kit, most likely something has been modified for someone to cast it. Do you have the rest of the parts such as a body or just the chassis.