i have used the clone coils with no problem. But i look out on the internet sites for used genuine ones from scrapped mowers. My titan gt has a 7hp briggs and that has a bigger version of the magnatron . If the paint has gone from the shroud and has no sticker you can tell the size by the number of bolts holding the shroud on, one bolt at the top 5hp two bolts at the top 7hp. Hope this helps.