Picked up "scratch & dent" P/N...282 blacklines on the cheap from ECS.
Noted they were made in Spain.
They looked like this:
Followed a bimmerforums tutorial on taillight restoration, except I used 1200/1500/2000 wet/dry soaked for 1/2hr with a little dish soap, and a drop more soap for lube. Alternating direction with grit of paper and polishes, until I used the DA RO buffer and black pad for Mequiars #7 show car glaze.
Got this:
In certain light, they still had minor scratching, and a little haziness in spots. So I went in by hand, lengthwise only, with 105 ultra-cut, 205 ultra-finish, and again with the #7 show-car.
Happy with the results, I cleaned 'em up real well with Armor-All auto glass cleaner, sprayed with 2 coats Meg's headlight Keep Clear, and let it cure for a day.
Installed, sealed with Meg's Ultimate Liquid, and went for a 500 mile drive.
Added Depo smoked/amber side-markers just to finish it off:
Rear flashers don't seem quite as bright as before, but I love the way they look on my DSB LCI 2012.
Took a bunch more photos (installing), used up over 1GB data uploading to imgur, but they never posted. So I seem unable to share.