Clutch Disc size specs needed.....

I am needing to have the clutch disc relined in my old 1970 yale
I would like to get in a new Clutch Disc and have it in hand so as to be able to do the R&R over a weekend and not have the truck down for a week or more, and apart and in the way, as would be the case if I just take out the old Disc and send it off....

Truck info:

Model
G83P-040-5WT074

Serial # P183595

This is an "Oil Spray Clutch" or "Wet Clutch" setup.

The Yale part number for the Disc from the vintage parts manual is:
5158774-00

The info the rebuilder needs is the Disc DIAMETER, NUMBER OF SPLINES and INPUT SHAFT DIAMETER.

Any help much appreciated!

dan k