OEM Duplicate Belt Replaces John Deere Belt Numbers GY20570, GX20072 Belt Duplicated To Meet Or Exceed OEM Specifications, Not A Generic Belt. Replaces John Deere Belt GX20072 or GY20570 1/2" X 104" GX20072 Belt Is The Same As GY20570 See Description Below for more information about Laser OEM replacement belts.