Sunbelt Smooth Black Wheel-Deck - 15/32 X 3-7/8" - B1CO108,01
Bearing Type Bushing Center Hole 15/32" Hub 3-7/8", Centered Hub Type Style Deck Roller Tread Pattern Smooth Wheel Color Black. MODELS: Kubota MID-MOWER DECK: RCB60-I,Kubota MID-MOWER DECK: RCB60-IA,Kubota MID-MOWER DECK: RCB60-IAE,Kubota MID-MOWER DECK: RCB60-IE,Kubota MID-MOWER DECK: RC40-G,Kubota MID-MOWER DECK: RC40-42,Kubota MID-MOWER DECK: RC40LT,Kubota MID-MOWER DECK: RC40LT-17,Kubota MID-MOWER DECK: RC44-G,Kubota MID-MOWER DECK: RC44-42,Kubota MID-MOWER DECK: RC44LT,Kubota MID-MOWER DECK: RC44LT-17,Kubota MID-MOWER DECK: RC48-G,Kubota MID-MOWER DECK: RC48-G20,Kubota MID-MOWER DECK: RC48-62A,Kubota MID-MOWER DECK: RC48-62F,Kubota MID-MOWER DECK: RC48-62H,Kubota MID-MOWER DECK: RC48LT-17,Kubota MID-MOWER DECK: RC60-20,Kubota MID-MOWER DECK: RC60-25,Kubota MID-MOWER DECK: RC60-72,Kubota MID-MOWER DECK: RC60-72A,Kubota MID-MOWER DECK: RC60-72H,Kubota MID-MOWER DECK: RC60-82H,Kubota MID-MOWER DECK: RC60-92H,Kubota MID-MOWER DECK: RC72-25,Kubota MID-MOWER DECK: RC72-28

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