I love Lawrence pickups. Thats why i have Fender RB4 and RB5. These are mint condition jazz pair, good for 4 or 5 string bass, exposed pole pieces, hand made by Bill in his shop. They were in a Warwick 5, that i have since sold, and I put back the (overrated) MEC pickups. Bill's pickups, to my ears, are hi fi, but with an edge. Sound excellent active and especially passive: they let the instruments true sound come thru, but with a preamp they kick but. From Lawrence direct they cost me $127.50 shipped and I had to wait about 8 weeks to get them. Make me an offer. Sizes are 3-1/2" for neck pickkup and 3-11/16" for bridge.