Our Jazz coils look just like, and are the same spacing as standard Fender coils. At the moment we wind them pretty much to the customers spec. So you tell us what you want and we will deliver!
Personally I cant stand active bass pickups, Ive taken them out of my Warwicks and replaced them with ours and the tone is so much clearer and has alot more "character" plus they respond very well to different styles of playing whether it be finger style, slap or pick. Actives seem to colour and sterilize the tone too much for me. I cnat see a problem with running them with an active circuit, although again I think it is better to make any adjustments in tone at the amp.