They come up on TB occasionally, used of course. Be prepared to sand and fill as often they are in less than showroom shape. Rarely they come up in junk yards. I toyed w/ the idea of using one on my 90 740 when I was doing that build. Decided against an entire kit as it was the skirts that I wanted. Was able to score Aero brand skirts for a 740 that were NOS. I like the larger spoiler that was used as well. Eventually, when I repaint my car, I'll shoot the existing bumpers body color. Here's a link to an average condition SE kit that was listed on TB last summer.... Turbobricks Forums
If you go to the top of this sub-forum, I have a sticky on my 90 740 V8 w/ pics of the Aero skirts and Volvo spoiler.
p.s. I've been called many things...but never a genius!