TWO STANDARD CONNECTING ROD FIT ONAN P218, P220 B48 BG48. BGA, BGAL, BGD, BGDL, BGE, BGEL, BGM, B48G, B48M, P218G, P218V, P220G, P220V, P248V, OL18, Ol20, OLV20, LX770, LXV770, LX790 & LXV790. IF YOU HAVE A EARLIER STYLE ROD THAT HAS A HOLECAST IN THE LOWER END YOU WILL NEED TO REPLACE BOTH CONNECTING RODS TO KEEP THE ENGINE IN BALANCE. LOOK AT SECOND PICTURE TO SEE THE DIFFERENCE BETWEEN NEW & OLD STYLE CONNECTING RODS. IF YOU HAVE A SOLID BEAM ROD AND NEED TO REPLCE JUST ONE ROD THEN OUR ROD WILL WORK JUST FINE, WE HAVE STANDARD. NOTE: THIS IS A GRAVITY CAST ROD, NOT DIE CAST, GRAVITY CAST IS A STRONGER ROD THEN OEM DIE CAST, CONNECTING ROD TORQUE. TORQUE ON OUR CONNECTINGS RODS IS DIFFERENT THEN ONAN SPECS, THE TORQUE IS. 22.1 FOOT ILBS. FREE PARTS AND SERVICE MANUALS ON WEBSITE FOR FREE DOWNLOAD, FREE TECH SERVICE. ALL OF THESE PRTS ARE NON TAIWAN OR CHINESE MADE.