Hello, I'm working on adding a hydraulic thumb to my BH90 backhoe. In researching I have found that the BH90 and the BH92 appear to use the same control valve (Kubota Part # 7K500-63010 ). since the BH92 has an option for the thumb I'm assuming that the same add on valve assembly (part# 7K523-8510-0) for the BH92 will work on my BH90? my question is does anyone know who manufactures that add on valve, or is there another source besides Kubota? I've looked into adding a diverter valve but think it would be a lot cleaner to do it with the valve assembly option if i can source something more reasonably priced!