Hi everyone...it's been a long time since I've been on here (deployed military here), but I'd like to offer any help I can give.
The widebody kit show above is the Rieger Tuning Genesis kit. I buy direct from the Rieger Tuning US importer and they don't even bother to import this kit. It's too expensive (almost 2500) just for the panels and then there is a TON of fabrication and fitment work to be done by a competant body shop (even more $$$).
Most likely the kit show above for the M3 conversion is a Zender widebody kit made for regular e30s to look like an M3. These have been out of production for years, and I have only seen 1 to date here in the US. It's on a white 318i that was involved in an s52 swap.
For those of you familiar with BMPs failed experiment on the wide body, I have sourced the parts they used for their conversion. I have a set that I would personally like to sell (yes I can get more) simply because they weren't going to flow with the body design I'm working on. If anyone is interested, I'll let them go for $225 plus shipping. The reason BMP failed to mass produce these is because they overpriced them, and they took preorders and never acted on them. (quote from Chris @ BMP).
I'm currently trying to source the Zeemax fender flares from the UK so I can do some molding work on them. This has been very hard for me because they are also out of production.
Any questions, please feel free to hit me up.