I have a 1641 in nice useable condition. I also have a 18?? with hyd steering. It's been used hard & not maintained. The motor is hurt. Would like the hyd steering on the 1641. For those of you in the know. What would be the best way to go about it? Steering tower from 18??& parts to 1641 . Or motor from 1641 on to 18??. Thanks .