I just got a Warwick Streamer Standard fretless, and the pups and electronics are weak!!!!! The pups are a really, really odd size which makes replacing kinda hard. Oh, this so happens to be a five string also. Anyways, I found a Bartolini pup that is an exact match size wise and looks identical, but it is for a 4 string bass. I have a 5 string.........will it work in my bass??????? The pickup is a Bartolini W4. My bass looks like the middle one, and the Bart is underneath it.