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you can purchase the coil split push-pull pot from Davis/ TyMusic or any other shops which sell it (just ask for a 500K push-pull switch). i have them in many of my guitars, my Ibanez RG471 (pic above) has one...
... it's in my Jackson as well.
Beez can install it for you, please get back to him on the exact charges: 9-7-7-3-2-6-3-3