I don't want to get screwed, and I may have...... how about this, I just got my blower back, it didn't include the stock pully, supposedly it has a 10% now, but other than a different finish, it looks like the same pully. I cant measure it because its on the blower and the nut is in the way, but it looks to be about 3 inches across the center (eyeballing it with a tape measure). I highly doubt that the company would trick me, but the pully just looks too similar to my old one. I'm probablly just being stupid, but i emailed and left a message about including my stock pully with the order a week and a half before it was shipped back to me, and when I called, it had already shipped and the guy sounded hesitant about sending my stock one back. please tell me the diameter or circumference (that, i can measure exactly) of a 10% pulley.