Does anyone know of a replacement pickup for a '79 Ibanez Musician bass (4 string)? The size of the old pickup is 3 3/4"x 1 5/8" . It almost has the same look as a Stingray, but with only 4 poles instead of 8. I can't seem to find a manufacturer who makes a pickup that will fit. If anyone knows of one I'd apprecirate their web address or phone number. -Thanks!