Short custom length pendulum rudder (less then 145 cm/57" )
The standard long rudder is 1.45 meters long and gives a mounting height of about 95 cm.
You can have a pendulum rudder made at just about any length if that suits your situation.
The standard rudder blade length is 85 cm, rudder stock and bearing tube can both be shortened to suit your boat.
A shorter than standard pendulum rudder is a free option with Y&B.