It's true I have had more then I care to remember, this standard is the longest lasting one to date, and I go through clutches like a knife through warm butter lol.
Plus the standard 7,8,9, is slightly bigger then the 4,5,6
I'd say most likely a 6 but you'd need to check. If you have a 5 speed clutch but don't intend on fitting a new flywheel even though you should then you'll need to fit a 5speed clutch.
Best to measure its out see what diameter the friction plate is