The Rotary 17670 Stack Pulley Bearing, the perfect replacement for your old MTD and Cub Cadet mower decks. This bearing is sealed on both sides and fits 42", 48", 50", and 54" decks with primary and secondary deck drive belts. 

Replaces
MTD: 941-0524A

Dimensions and Specifications
HOLE/INNER DIAMETER    5/8"
OUTER DIAMETER    1.56"
THICKNESS    .468"