I just put the Seymour Duncan Alnico ll MM pup into my new OLP Stingray. Excellent upgrade. I got the bass for $229 and with this modification, I now have a really nice sounding, looking, feeling bass. I got the pup, two pots and a shematic from Black Rose Customs for $83 including postage. This guy John is your best bet for advice and price on after market pups. I'll save up some money and go for the SD MM tone circuit and turn this mutha active.