Hi John
The alloy stuff has been stripped where necesary with Nitromors paint stripper, then sanded with rough and fine grades of wire wool, then polished on one of those DIY polishing kits you stick in a drill.
I have brand new top nuts waiting to go in.
The colour is the metallic burgundy that loads of these were painted, my garage lighting just makes it appear more orange in the photos.
Regards
Dave