I think OEM can mean they are Bearmach or Britpart etc still it is all a bit naughty really the manufacturer should be shown.
I did consider re chroming, BUT from what i have found the pits tend to be fairly deep, i think it is when the rust gets under the chrome it seems to rust out a little pocket, I did consider seeing if a mate could braze them? then I could smooth them off and get them chromed, but i decided it sounded like a lot of work for a bodge job,