Info if not seen...
http://contact.bartolini.net/support/solutions/articles/5000587194-ibanez-basses-pickups-and-electronics
SR800, SR700, SR500, - MK-1-4 can be upgraded to MK4CBC with HR-5.4AP
MK4 form factor http://www.bartolini.net/?s=mk4&submit=Search
Humbuckers, Splits, Singles, Dual, Quad...