BP555S and BP555L Clutch Rollers
The old style BP555 dispensers used two different types of clutch rollers.
The left clutch roller fits on the BP555S, BP555L36, BP555L-45 and BP556. The part number is EA52AXX.
The clutch roller on the right fits the BP555L-72 and BP555L-90. The part number is ELA52XX.
Note the main difference is the distance between the rubber roller and the gear.