[ilmiont]

Hmm my locking wheel bolts look much worse than yours! I've been looking at this very recently, incidentally.

I have two kits of regular chromed wheel bolts on the way from Volvo (10x in each pack) as they're scruffy too, but the original McGard lockable bolts are no longer available - part no. 31373396 shows in VIDA, but has been superseded by the new-style bolts fitted to later cars. These are not described as being chrome-plated anywhere I've seen.

So I need to either:

1. Forget the lockers, as you have done, and fit the new shiny bolts all round.
2. Source a new set of McGard lockers which match the originals.
3. Fit the new kit from Volvo but they might not be as shiny.

Your post is making me think I'll go No. 1 to be honest.