This is a brand new mower idler pulley. The specs are as follows:

    •  Flat Idler w/ flanges and heavy-duty bearing. Steel.
OD     4-1/2"
ID     3/8"

 Replaces part numbers
 
        2189     ROTARY
    275-457     STENS
    34-023     OREGON
    34286     GRAVELY
    57582     SNAPPER

Thanks for looking!!

B1SB2189