So I'm planning to upgrade the pickups in my Peavey Milennium 5 (passive) to the Seymour Duncan Quarter Pounds. (my peavey has 2 J-bass style pickups.) As well, I plan to change the wiring from the current config of vol-vol-tone to vol-tone and a 3-way switch. 2 questions: 1. I'm pretty sure the QPs will fit my bass (did some measuring of my current pups to the dimensions of the QPs), but has anyone had any trouble with them in terms of fit? 2. Would I also have to change the pots, or could I get away with using the existing ones and re-wiring them to the new pickups?