Depends which 'age' of Z225 you have.
There are three serial number breaks on the Z225 operators seat.
The later version (S/n 100001-) shows a more padded seat and springs under the mounting plate.
Seat
Part Number AUC14765
Description
Seat - SEAT, 15 INCH, FOAM IN PLACE, NO SP
Remarks
ORDER AUC14765; ALSO ORDER (6) M72693; SUB FOR AM136801
This is the same seat as fitted to the Z235, it seems.