Rotary 12812. Scag 424367 Dust Shield for Idler Pulleys. This can be used to protect any idler that has an unprotected bearing. 3/8" ID 2" OD. min 5. Fits Hustler, John Deere also

Replaces
HUSQVARNA: 5120254501
SCAG: 424367
WRIGHT: 71460128.