Be careful.....I replaced my coils and used Four into One. When I initially purchased and received the coils, they would not work, i.e., didn't fit the existing stock mounting brackets. I initially ordered the first set on-line without talking to a service rep. After calling and talking with them, I received the correct coils (they are not Honda but good repops) that fit and work great ......so, would highly suggest you pull up Four into One, get their number and talk with a service rep first. Emphasize you have a CB500 (4 cylinders) and intend to use the existing mounting brackets (if so). I had no problem with them taking back the wrong parts and have ordered other parts from them with good results. Good luck!