on 550....they have to be right OHM..elektronic egnision use abaut 3,5 ohm...old standart knikser use ca 4,5 ohm..think kavasaki coils still can be faund..a bit harder to find honda brand...(in denmark)
car parts can not be used..
its possibel to fit new vires to old coils..have to cut them open..to do it...search..and find