I have 2 pairs of supercharger pulleys for sale. Both sets spin perfectly, so if your bearing are rough, here are some cheap replacements. Milage is unknown, but again, bearing feel great and spin freely.

Set 1:
Moss Tensioner Pulleys (Nylon) - $40



Set 2:
Track Dog Racing Steel Pulleys - $35
These do have a bit of surface corrosion on them, but worked great before I switched to fresh ones due to my ---- retentive need to have a spotless under-hood. If you are not as picky as me, these are 100% functional and work great.