55 tooth rear drive pulley for Sportster

[ray2001]

I have a 2001 XLH1200, I recently found an article by Chuck Hawks that recommends changing out the 61 tooth rear drive pulley for a 55 tooth one. This will lower the rpms at speed and keep the vibration down at 60-65 so It will be smoother. I can't get anyone to tell me where to find this Pulley, HD won't give me any suggestions, I need to know if I will need to also change out the drive belt, and is there an HD number for the pulley? Anyone out there got an answer? Supermax has a pulley with 58 teeth, but it is way too pricey. One local shop can get a 55 tooth pulley, but he will not guarantee the fit or results.