Smokinjo
Full Access Member
40mm will be fine. I used 40mm that I found. I would also suggest just getting extra 8mm nuts and grinding down two sides where they will fit between the holes in the bracket. I did this rather than using the 6mm nuts. It worked just as easy. Just make sure they are lined up with the bracket prior to install. Hardest part of the install was putting the lights on with the limited room to start the nuts. I didn't want to cut the plastic back to far.
Hope this helps you.
Hope this helps you.