Hi Barry. I fitted one of those 4 spring clutches to my 1971 OIF motor.I found a 7 plate set of plates,added a Alloy pressure plate from SRM
and now have the sweetest clutch you could hope for. No more grinding into gear-oily snick when cold. Also replaced all the springs and cups etc .with New T140 750Bonnie ones.Cheers.Beer now.