I would bet he uses so many different guitars and pickups that it just won\'t matter. I own about 26 guitars, most of which are electric. Name brand pickups..eh, not all they\'re cracked up to be. I buy a lot of pickups from parts brokers which means they\'re equal or greater quality, somewhat custom and a loooot cheaper.
Anyway the point is, you want to find pickups that compliment your guitar\'s sound rather than buying some celebrity guitarist\'s pickups thinking you will get the same sound. Sure some pickups will sound great no matter what you put them in but that\'s not always the case.
I\'m betting buckethead does a looooot of frankensteining. If you\'re interested, I know some great suppliers on ebay. My favorites to date have been thinblade humbuckers, quad rails and a few select humbuckers from my favorite brokers.