@18 Wicked Special I’ve been in contact with @Rachi79 and I will be helping him out soon.Agree, sounds like some heat is the next step(aluminum expands greater than steel). If that's a no go, then you'll have to drill the bolt out. A bit just under the thread size to a depth just short of the fender, then snap it loose with punch. Remove the remainder in the slider(ream) with a bit the size of the other holes. Then carefully remove the thread end out of the fender. Hopefully Mike U is close enough to get you out of this jam.
I’ll be bringing the necessary tools with me just in case.
Hopefully we will get this all squared away.