Switchcraft 722A DC Power Jack with 2.0mm Center pin, accepts 5.5mm barrel. Bushing mount, with hardware as shown.
Calrad 30-720-2.1 DC Power Jack with 2.1mm Center pin, accepts 5.5mm barrel. Snap-in mount, in 0.375" hole.
Kycon 2.5mm DC power jack - Package of 4
Calrad 30-374 2.5mm DC power plug
Calrad 30-374-14mm 2.5mm DC power plug with long 14mm barrel
Calrad 30-337 0.7mm DC power plug - 2.35mm OD