We have two generators which have Kuboto D1105 engines with Off, On, GL and ST positions. Will this one fit?

As far as I am aware this Kubota ignition is just a preheat, start, run switch with 4 wires so it should be suitable for starting most manual gensets. This one has the Off, On, GL and ST positions so as long as you have 4 wires on the switch, it should be okay to order.