I have a set of replica(I think) 99spec parking lights that came with my FD. They are scratched up pretty bad on the lenses. I was wondering if there's a way to either a: replace the lense or b: polish them.

Or should I just buy new ones?

 

yes, you can polish them... start with 1000 grit and work you way up to 2000 grit by wet sanding the lens...cut it even more with compound... then once all that is done you can polish it up with a polish and then wax it