Here are some pics, sorry I dont have one of the bolt removed....It is a smaller version of a carriage bolt. I believe its 1/4" or 5/16" with nylon lock nut then plate, really thin washer and the bolt.
Actually there it is in the 2nd pic with nut n plate attached. Not sure if this will help the reverse issues though. Lemme know if you need more pics.
Oh yeah, call Brewers Performance, they have everything you need.