This listing is for one (1) ne left hand (drivers side) electric trailer brake assembly that replaces Dexter K23-446-00. It measures 5'' wide and fits the 12.25 (12-1/4) diameter. We also stock new oil caps, wheel seals, bearings and drums too! We are here to help and are knowledgeable of these parts.Feel free to send us pictures of what you are looking for so we can help you be sure it is all correct! This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts & Accessories\Towing Parts & Accessories\Trailer Brake Controllers". The seller is "brakepartssince1963" and is located in this country: US. This item can be shipped worldwide.