[BobsM3Coupe]

Originally Posted by elp_jc

I'm on dirty clothes from doing work on the yard, so let me finish, then slip under my car and I'll edit this post with the answer. Looks like 12 or 14mm to me.

I'm a nice guy and checked before continuing with the yard. Both are 14mm, just like the bikes. Cheapest way to get it was a 3-piece set (12, 14 and 17mm for $10) at Autozone. At least it was a few years back. And yes, if you're skinny you can slide under the car without lifting it . Hope this helps.

Thanks for the info.