There are a bunch of people that make "60s spec" P pickups. Fralin, Duncan Antiquity, and that Fender. They all sound a little different, but are all good. By '69 I'm not sure if things had changed at all with P-basses. By later in the '70s the pickups seemed to be wound a little different. Seems like the older pickups have more "air" in the high end and the later ones have more "grind" ... but then again the bodies also changed to Ash, so that could be what I'm hearing. Anyway I can't imagine you'd be unhappy with any of the three pickups I mentioned above. The Duncan is the fattest and warmest, the Fralin has the most edge (from what I understand -- I have used their
Js a lot but not the P), and the Fender is the most neutral and honest. But they're all pretty close. I have the Fenders in my '69 and '72 Ps and they sound great.