Alternator pulley with 8lb lower

[mpe331lx]

I need to know what is the correct alternator pulley that I should be running with an 8lb lower?

 

[04torchred]

Get at least a 3.9" or 4.0" alt pulley. I have been running my 8lb lower with a 4" alt pulley for over a year and around 35,000kms with no charging issues. Still on the stock alternator with over 71,000kms on it, never been changed.