NAICHI ARAMID Replacement belt for KUBOTA 48” single belt Suits RCK48P-124Z Up to serial no.50374 On the following machines Z122EBR Z121SKH Z125EBR Z125-SKH-AU Also suits ZG123S ZG124E Please note that some machines may have had a later conversion with a different tension arm being installed . The belt required for these conversions and later serial no.s is K5579-36820 If you need help with your kubota belt selection send us a message with your machine model and deck model no.s and we will confirm fitment.