Hi mrkhemlani ,
Probably a 7/8 PTO shaft, I think common size for the length is around 50 mm ,62 mm and 70 mm , could be a 70 mm.
The easiest way would be to measure the PTO shaft ,usually you can just look at the crank underneath the mower
and you can tell if the replacement motor is the same length PTO.
I would think a Rover or Masport rear discharge mower with a Briggs should be the same length,
Cheers
Max.
