I had a EMG set J in my MIM fender, now i want to find another set for my project bass so I'm looking for used pickups. anyway, i couldn't find EMG set on the net. but there's a guy want to sell me two EMG LJ (bridge pickups) I looked into EMG's website and found there're no difference between the J(neck) and the LJ(bridge) pickup unless the dimensions. is that so ??? so they have a same specs ??? anyone know ??