This is a Replacement Exhaust Adapter for the OS Max BGX-1 3500 (OSMG0352) / This is adapter is used to mate the exhaust port with conventional / style muffler ports. BGX-1 has a unique port and a 3-bolt pattern / instead of the conventional 2-bolt pattern / / INCLUDES: One Exhaust Adaptor that mounts between the engine / and the #5010 muffler (its the stock muffler for the BGX-1). / Two 5 X 15mm Socket Head Screws to attach this adaptor to the engine / _ / SPECS: Exhaust Port Opening: 30mm X 14mm (1.18" X .55") / Engine mounting screws width: 42mm (1.65") This is the distance / between the centers of the screws that mount this adaptor to the / engine. / Muffler mounting screw width: 60mm (2.36") This is the distance / between the centers of the screws / Thickness: 10mm (.39") / Overall Width: 71mm (2.79") / Overall Width: 24mm (.94") / JBN 4/1/94 / ir/jl