DTMfiberwerkz is bottom of the barrel quality. I saw their stuff on bimmerforums/r3v a lot when I had my e30s/e36s. As someone else mentioned, just buy the Kerscher bumper. It is superior quality and cheaper than the Ebay auction you posted.
AR Catless Downpipes | Berk Full Street Exhaust | HPF FMIC | COBB AP | aFe Magnum Stage 2 | E93 M3 Front Sway Bar & Bushings | Michelin Pilot Super Sports | Hardwired Radar | Eurotek BBS LM | Schmiedmann LCI Blacklines | BMW Performance: Spoiler, Diffuser, Shift Boot, E-Brake