Just for a point of clarification, wouldn't your USA Standard 61 have been equipped with 60s Burstbucker pickups from the factory? I thought Custombuckers were exclusive to the Custom Shop... BTW, I've put Seymour Duncans in many guitars, and they never let me down! :dude:
Hmm... The only options I'm seeing on that page are for buttons (single/double ring) and post height. They all require a 10mm hole for the threaded bushings. The Kluson Deluxe need an 8.8mm hole for push-in bushings. Sorry if I'm missing something, papagayo.