Had SuperMax put their poly teeth on my rear pulley. It's great! Couldn't be happier!
The drive belt had been making a lot of noise because after 20,000 miles the teeth on the factory pulley were worn out. Tried several remedies that I read about on this site; silicone spray, bees wax, lanolin. All worked for a very short time, but obviously didn't fix the problem.
Really wanted to keep the factory custom pulley because it matches the rear wheel. (Can't find another one.)
Didn't mind spending the money to keep the 'custom' look and have a pulley that's going to last a very long time.