Seymour Duncan - Which pickups have you found split particularly well? Here's a useful coil split mod, especially with a '59/Custom Hybrid where you can decide to split to the Custom (slug)
Coil-Splitting a Humbucker Pickup with a Push-Pull Pot - Humbucker Soup
Amazon.com: Pro Wiring Harness Pots/w 3 Way Switches with push pull coil tap from korea : Musical Instruments
Coil Tap using Push/Pull with a 5-way | Official PRS Guitars Forum