I will toss this out there - if anyone has the "old style" (non-rounded) FD3 P-tone and FD3 bridge pickups they somehow don't want... shoot me a messageIf I'm going to end up messing around with preamps, I'll want to mess with pickups too, and these can't be ordered from Sheldon any longer.
I've got a a FD-3 (4L) neck pickup that was replaced by a P-tone pickup laying around somewhere. I believe this pickup is the 2nd generation after the original FD3 pickup. Message me if you're interested.
FWIW...Ran across this thread that described the difference between a FD-3 (4L) and a P-tone pickup.