I have a ESP F-104 and I would like to get a deeper and detailed, more pro-sounding tone out of this bass without having to buy a 2000 dollar bass. I just need to know what pickups would fit the cavity of this kinda bass; I tried looking for pickups but they don't say the size in centimeters or anything, and I dunno the real diference between a P bass and a Jazz bass or all the other pickup types. Can anyone suggest me anything?