mcgregor got did

Wanting to buy either a 3.2" or 3.5" Alternator Pulley. I have a 4# Lower and reading some forums people has had good luck with both. I had a 8 rig that is now damaged but I would really like to find me a 10 rib. Also looking for either a 3" or 3.25" for a 3.4 Whipple. Thanks in advance.