Right Clutch Pressure Plate?

[Nico73]

At first, thanks a lot to everybody for supporting me

My truck has a 1937 V8 with 21 Studs. In some older Threads, i read that The actual clutch in my Truck was for Ford Traktor.

The clutch engage, when i am on The Last threads of the connecting rod....
So, a cheap Solution would be, to weld a longer connecting rod, but i prefer the original clutch instead.

Is there any way to measure the diameter from outside?

I will take out the engine on wednesday to see what is ging on.