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I thought I'd take a look at 'what if the J6 died. They not easy to replace. I had two jazz bridge pickups laying around. One was from a Mikro. The pole pieces didn't align quite properly with the j6 pickup cover holes. So rather than muff the cover, I just took off a couple of ears from each jazz pickup cover, and nasty glued them together with a 2mm partition between them made from a bit of pick guard. Bit of a rough job he he. This made the combined cover width around the same width as the J6 pickup cover. I put the pickups in with some padding under it, like the JS has, but didn't use springs like the JS does. As for the sound. Didn't really notice any differenceI would wager that would work, as the coils in the J6 do look like standard J coils.
As with J pickups, there are some variables.
1. They need to be the same length. There are neck length and bridge length pickups, as well as small variations of each from various manufacturers.
2. You have to get pickups that line up the polepieces correctly with the cover.
3. Best to get a set that is RW/RP so you can continue to get hum cancelling in series and parallel mode.
4. IIRC, the J6 pickup has ceramic magnets with coils wound around 7.9-8K. Makes sense, wound to sound good in series mode, clear in split and parallel modes.
Finding these is not an issue with many of the boutique and smaller pickup makers being able to wind those right up, as well as with the Duncan custom shop or perhaps a special request from Dimarzio.