This listing is for 1 Aluminum Carb Fuel Rail for Suzuki GS550, '77-'79 Model years   Replaces oem # 13685-47030  and fits bikes listed below.    Replaces those hard to find leaky oem rubber ones  shown in picture. Measures 41.75 mm overall length .  These are precision machined from solid aluminum and include four replaceable o-rings. Measurements taken directly  from OEM part.  Holes are drilled out slightly larger to flow more fuel.      For stock and modified engines.  100% Made in USA