Rear Slanted Leg Caster Assy. Only 1 Of These Legs Is Used For Each Grill. Looking at the grill from the front, KIT0140 is the back-side leg, KIT0139 is the front-side leg.
NOTE: for those of you who have a Traeger grill WITHOUT casters wheels and want to add them, the caster adds an additional height of about 4 inches to the length of the leg, unless you change all four (4) legs, your grill will not be level.
Smaller grills in each series do not have caster wheels but have skid pads instead. Try lightly lifting your grill and pushing it instead of lifting and pulling.