This set of WalthersProto Universal Truck Mounting Adapters simplifies installing WalthersProto trucks on other manufacturer′s HO Scale passenger cars. Kit includes enough parts for 12 cars (two each), and each is a one-piece molding for easy installation. The Universal Truck Mounting Adapters are part of the line of WalthersProto HO Scale trucks, wheels and couplers. Allows WalthersProto passenger trucks to be easily mounted on other makers′ cars One-piece molding Converts up to 12 cars