multipower input seal

[old codger]

MF35x .I am installing new seals to the input shafts and the seal between the PTO shaft and the main shaft has to be pressed about 65mm up the PTO shaft from the rear. The book/books say use tool mf256 which not only holds the seal and keeps it square but also slids it to just the correct distance in. Since I havn't got tool 256 can somebody tell me the distance from the seal holding shoulder to the insertion depth shoulder? I will then make one to match.