The turn signal light listed here will fit some Kioti tractor models such as CS2210, CS2410, CS2510 CK2510, CK2610, CK3510, CK4010, DK4210, DK4510, DK4710, DK5010, DK5310, DK5510, DK6010, NX4510, NX5010, NX5510, NX6010, RX6620 and RX7320 tractors. The diameter of the light is 4.5″ plus the mounting part. Some later serial numbers do take a different light.