GM lock cylinder springs would be to small for coil spring on suspension but throttle linkages yes. If, like previously stated, cut and stretched a little. Might wanna check your local shops. or wrench turnin buddies
I use these also and don't seem to have problems with the gloss but I have the same problem with the flat. The only tip I can give is with the flat I have to do 2 coats, letting them dry completely otherwise you will still pull the first coat off. I could see that working for the gloss if its thin also. Hope this helps