I got the clutch disk from a local agco dealer and the clutch disks are the same size. large or small I don't know as I have nothing to compare them too.
I don't know what the setting of the pressure plate release levers are. IT worked fine one day and then I split tractor and rejoined tractor without even touching the clutch so everything there was the same as before.

The clutch diskwas and is installed with the long neck toward the engine as the manual says.

I am not sure what you mean by alignment pins?

Thanks for your replies.