I've found brushes at places that rebuild starters and alternators. My last blower repair was a few months ago in my '91 Acura Legend. The local alt shop didn't have any brushes that fit, but they did have a nice pair that were too big. The price was steep; free, but I gave him $5 lunch money anyway. I sanded the brushes to fit, soldered the two wires in place and that was that. Oh, I also cleaned ans sanded the armature (where the brushes touch), it was kinda nasty and rough. I used 400 paper.