Yes, I didn't mean a split coil like the normal Preci, but a humbucker in singlecoil format.
There are many available.
The Haeussel and Nordtrand already mentioned.
Seymour Duncan does a stacked version, that is a custom shop pickup and will need ordered through a dealer as Seymour Duncan do not sell direct to we Europeans. Mr Duncan can f**k right off
Fralin sells a split single coil. Friend of mine was not impressed with his.
Jess Loureiro did wind hum-cancelling single coil footprint but I don't think he is still trading. Pity, very nice pickup.
Over in Wales, Martin Herrick sells various options. I've used his Neodymium 51 and his quad coil version.
Another UK pickup winder for 51 hum-cancelling is David at Bloodstone Guitar Works. Nice work, quick turnaround and very affordable.
I do like David's pickups
Yet another UK pickup winder I would recommend is Martin Harmer. Just a young fella, trades as 'Charm Pickups'.
From Martin I've had split coils with alnico 2 slugs, a 51 single with alnico 2 slugs and a standard 51 single alnico 5. When I built my 51 slab body jazz bass Martin got the pickup job. Requirements there were standard 51 alnico 5 single coil at the usual position, wider 57mm pole spacing 51 single coil for bridge position; RPRW for hum-cancelling with both Vol even and wound hotter for balance.
There is another method to achieve hum-cancelling without swapping pickups; fit a dummy coil. A cheap Tele or Strat ceramic pickup would suffice, just make make sure you use the opposite polarity from the PB-50 pickup. If yours is north face, get a south face pickup.
Knock the ceramic magnet off the guitar pickup, solder in series with the PB-50 pickup and hid the guitar pickup beneath the scratchplate. OK it's slightly more involved, not by much, but I'm only offering the suggestion as food for thought
