THIS IS THE IGN COIL ON ALL CT90'S K0 THRU 1979. MAKE SURE YOU NEED THIS BEFORE YOU ORDER IT BECAUSE THERE ARE NO RETURNS ON ELECTRICAL PARTS. IT COMES WITH A NEW CONDENSOR. here is the scoop on the st90's fitment (thanks!! Dean) Jack, This coil is a fit on the ST90! Bolt holes match and the TEC# is the same as the original. The one difference is the leads. On my old one the green has a female connecter and the new one has a male> Not a big deal! Thanks, Dean 38A$79.99 SOME COMMONLY USED TERMINALS _ CLICK ON PICTURE TO GET TERMINAL'S "TM" NUMBER