Fan Belt.  Fits: Most Oliver Super 55 (Power Steering), 550 (Power Steering, s/n <72831).  Super 66 (Power Steering, s/n 39846>), Super 77 (Power Steering, s/n 40959>), 770 (Power Steering, s/n <73638). #M372B.

For correct Belt Application,... Oliver_Belts