Some Non-OEM alternators have the nut sticking out of the alternator pulley. Mine was very close to the frame rail, probably within 3mm or so. You can either move the alternator to the back position, by putting the spacer on the other side, or grind down the nut/shaft.
If I recall, that is the kit I sold and looking back, I'm not sure if I sent you the belt. I believe the belt that comes with the kit is shorter and pulls the alternator closer to the motor, avoiding the frame rail.
If I sent you a belt, ignore this. If I didn't, PM me your address, I'll find out which belt it is around here, and mail it off to you.
/brox