I just bought a 2007 FatBoy that had a rigid mount sissy bar previously installed. I was in the process of removing it, and ran into the rear-most allen bolts being impossible to remove (have since stripped the head and allen socket is useless). On each side, I made a few turns...and then nothing further. No sign of locktite or similar. Fender doesn't appear to be holding up progress. The front bolts came out with no problem. I previoulsy had a 1995 FatBoy and never had this problem. Any help would be appreciated. Thanks.

I had to use vise grips on mine

thanks tlb. vise grips and a file to square the bolt heads, did the trick.