SUNBELT Scag Drive Pulley - B1SB7124.

Drive Pulley.   Double jackshaft wheel drive pulley fits 36", 48", 60" and 72" mid-size walk-behind units.

Height 1-3/4"
Inside Diameter 5/8"
Keyway 3/16"
Outside Diameter 3-1/4".

Crossed from:
38210 BOBCAT
48199 SCAG
482645 SCAG
363137 ENCORE
7124 ROTARY
78-673 OREGON
78673 OREGON

MODELS: Scag (UNDEFINED): SEVERAL

This is an Aftermarket product, not an OEM.
Thanks for looking!