Would anybody possibly know if it's considered EMG sizing or the actual pickup sizing for the pickups used in the bass itself. I'm wanting to go Bartolini, Aguilar, Nordy's or a Custom set of Kent Armstrong made in the style of Smith pickups. Just need exactly to the mark measurements. I've landed a deal where the seller wants to sell his M7, after he returns from a mission's trip with his church. So I wanna be one step ahead with already having my pickups to change out. Thanks for the Info and God Bless.