Hello! This listing is for 1 (one) K23-439 Trailer Brake assembly fits Dexter axles 10k with electric brake on the right hand (passenger side). This unit has a diameter of 12.25'' by 4'' wide. It uses 7 bolts to secure to the axle. We also stock wheel seals, premium Koyo (made in Japan) bearings, plastic oil caps, brake drums and much more. Please know we strive and do ship products same day! Thank you for checking us out! We look forward to serving you! The Right hand side assembly is listing number 275470423459 

We offer free shipping, free returns, and no restocking fee!  However, if you choose not to keep the item, we will be happy to refund you upon receipt of the unused/uninstalled product, but we will deduct the cost of the initial shipping.