The 9J1 L/S is the Fender Jazz Bass ( J Bass ) replacement pickup set with a long-length for the bridge and a long-length for the neck. The set is highly respected by musicians and luthiers alike for its deep tone, strong lows, low mids tone. They feature a dual in-line coil design. The original series bass pickups with passive designs. They are cast in epoxy to remove unwanted feedback and microphonics.
The lengths of the neck and bridge pickups in the original J-basses are not equal. The neck pickup is 3-3/4" long , and the bridge pickup is 3-3/4" long. Please check the physical size of the pickups you want to replace to make sure the replacements fit properly.