MOWER DECK BELT & TRANSMISSION BELT. MOWER DECK BELT PART # GX20072 / GY20570. MOWER TRANSMISSION BELT PART # GX20006. FITS : LA100 LA110 LA115 LA120 LA125 LA135. BELT SIZE 1/2″ x 89″ & 1/2″ x 104″. The Model number is usually under the seat of your mower. BOTH BELTS ARE HEAVY DUTY. DOES NOT COME WITH BELT SLEEVES! Interstate Supplies and Services. If the item is found to be defective the customer may send the part back for inspection from Provenpart, if the part is considered to have a material defect Provenpart will send the customer at no charge a replacement part. The free listing tool. The item “John Deere 42 LA100 LA110 LA115 LA120 LA125 D110 D120 Transmission & Deck Belt” is in sale since Thursday, August 17, 2017. This item is in the category “Home & Garden\Yard, Garden & Outdoor Living\Lawn Mowers, Parts & Accessories\Lawn Mower Parts”. The seller is “interstatesuppliesandservices” and is located in Matthews, North Carolina. This item can be shipped to United States.