The 20-Series Kadee Magne-Matic Couplers are designed for either Talgo (truck) or body mounting. The #28 Kadee Magne-Matic Coupler features a very strong plastic isolated coupler, #634 Centering Spring, (same gear box as the #5 Coupler), insulated #232 Draft Gear Box and Lid with side and center screw holes for mounting and the (20-Series draft gear box) insulated #213 Universal Adaptor Plate. The #28 Coupler easily installs in existing Talgo-mounted draft gear boxes or can be body mounted with supplied #232 draft gear box (#5 Draft Gear Box) with side and center screw holes for mounting or with the supplied #213 Universal Adaptor Plate (20-Series draft gear box). Note: The 20-Series assembly may be mounted from the top or mounted from the bottom but the #634 Centering Spring must be always mounted on top of coupler shank. Two pair per package