Blower Bracket

My blower bracket sits in a little bit compared to the rest of the pullies, so the belt isn't running straight causing belt ware. I never noticed this before until I changed heads. Is there a spacer I could buy to bring the bracket forward to line up the pullies? I would make one, but it is tough to measure how thick I would have to make it. Is there anyone out there that had a similiar problem, if so how did you fix it?