I am not familiar with that model but the thing that jumped out in a 4 cylinder Ford. It is possible that the same engine is used on other equipment and you can find a radiator from one of those. Radiators are pretty simple anyway, so I would take some measurements and head to a junkyard looking for one from a bigger engine that would fit. That route would require some custom mounts, but could be considerably cheaper than a special equipment dealer would charge.