I bought a new 90amp alternator for my 1991 redtop saph cossy. Now, the pulley on the new alt is a multi v pulley & my old alternator has a bouble V-belt pulley. Is what i would like to know is are the pulleys interchangable? If they are i will be fitting my original pulley to the new alternator & visa versa.

Help much apprciated
Regards in advance
Andy