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 

• Allows WalthersProto passenger trucks to be easily mounted on other makers' cars
• One-piece molding
• Converts up to 12 cars