Long Threaded Barrel Input Jack, Stereo, Black, Switchcraft, With Nut and Washer. Accepts 1/4" plug, and can be wired mono or stereo. 1/2"-diameter mounting hole,needed and at least 7/16" wood thickness are required for mounting. Overall length 2".
This is the best jack you can buy for a jack design that is awful. I hate barrel jacks, so if I buy a used bass that has one, they instantly get this upgrade.