My main supplier is Lundgren Pickups (located in Sweden). Their high quality work and good communication is what keeps me sticking.
Their M8/M7 is the standard pickup I use. It's Meshuggah's number one choice so that's why I started using them in the first place.
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At Lundgren they can make slanted pickups as well.
For the controls I make custom PCBs to connect the very nice MEC pots. Very neat looking!