MTH is not currently producing these pre-packaged replacement truck pairs, but you can order individual trucks from MTH's parts website, at https://mthpartsandsales.com. The part number for these Roller Bearing trucks is DA6200013. Product Specification: Product Line: Premier Scale: O Scale Release: Dec. 2005 This items are no longer pre-boxed, they will come in bags. Features: Die-Cast Construction Sprung Wheel Sets All Metal Wheels & Axles Die-Cast Metal Operating Coupler Overview: These easy-to-install die-cast metal trucks feature metal needle-point axles and fast-angle metal wheels for superior friction-free roll. The detailed truck sides are sprung for a smooth ride over bumpy track and switches and the operating die-cast metal couplers work with any manufacturer’s O Gauge uncoupling track system. M.T.H. O Gauge freight trucks are compatible with all manufacturer’s O Gauge couplers ensuring reliability no matter what type of car you install them on.