Welcome to the forum, and congratulations on your purchase. What possessed you to do something like that???
The headlights are BMW E39 headlights from the 2000 model year. The lens cover is part of the whole housing unit, and not something that can be replaced separately. Lots of aftermarket E39 headlight units out there. I bought new aftermarket E39 headlights with projector beam headlights and LED "angel eyes". It is not that difficult to change them yourself if you are so inclined. They look 1000 times better than the crazed ones.
Redlands Truck Service might do the headlight swap now. I know I have talked to him about it after I did mine myself.
I need to find somebody to remove the 3M on mine as well. I don't have a recommendation for where to go, but there is a decent chance that the paint will be damaged taking the old one off. Or so I have been told.
You might contact the Paint Department in Chino. 800-544-5033. I have heard good things about them, but have never used them.
I think there was a thread on here about those vent covers. Search the Alpine Coach forum and you can probably find a source. I think it some found them at a marine store.
Enjoy your purchase! And consider joining ACA and/or Alpine Socal. You will meet lots of fellow owners who can help you with questions like this.