Good luck... I'm trying to find one myself, been looking for over a year with no luck. I think only the Gen II version is available at the dealer now, about $1400 wholesale (ouch). Never seen any copies for sale. I'm looking for a Gen II front bumper, used, in good shape if anyone knows of one.
FYI... the Gen I have square holes for the driving lights, the Gen II has half-moon shaped holes. I need the Gen II.
Here's a photo of the Gen II front bumper:
Full "B6-" kit:
More photos of both Gen1 and Gen2 kits:
http://www.w124performance.com/images/W124_AMG_kits/