I have a hyd.unit I would like to put on an old 102 cadet that I am restoring. does anyone have some info as to where I would drill holes in the frame to mount the unit. it drives with a belt off the rear of the engine. the unit has three holes on the mounting plate with spacers but there are no holes in the tractor frame,and the holes would have to be drilled correct so the belt would line up correctly. also does the lift rockshaft have to be changed.