M3 V1 Install w/ CF roof

So, I just picked up the new M3 coupe on Friday and have already begun to have fun. I looked at the post from Tim330 on V1 DIY, however, my M3 has the carbon fiber roof. Turns out that there are no bolts to which you can mount the ground wire. There are holes in the sheet metal, but after a couple hours at Lowe's I gave up on finding a bolt that would fit. Has anyone else run into this problem yet? So far I have come up with a couple possible solutions:

A. Remove the stock prong thing for the ground wire put a tap on, and just tap into a ground wire.

B. Sand off an area of the metal that is present and just use conductive epoxy or some other type of adhesive to attach the prong right to the metal.

C. Just get a metal screw, and drill it right into the metal.

I posted on E90, but figured I would ask some folks on here...I still look here, so I figure someone that can help still does too.

If anyone has any suggestions or easier/more elegant solutions, feel free to send them my way. Thanks.

Well, I decided to go with C. Drilled a short sheet metal screw into the metal part and attached the ground. It's working just fine.

brave! i dunno if i could drill into my new M3 like that

Originally Posted by simsima325

brave! i dunno if i could drill into my new M3 like that

I caught the metal filings, ! I didn't want to do it, but it was definitely the easiest and best solution. Tapping into another wire is messy and just introduces more to go wrong. I made sure there was nothing behind the metal. It was pretty weird putting a hole into a car I had for 3 days though!