I've got a 1965, straight 6 200 with a manual 3 speed. I need to replace the clutch but have noticed that there are two sizes available. ( 8.5 inch or 9 inch) I know I could remove the old clutch first and measure it, but I want the new clutch when I start the job to save time. What size clutch should I order?
Thanks!

 

there really is no other way to find out than to pull the old one first.