I recently purchased a used Kubota BH 77 backhoe, for my B7800 tractor. I read that the subframe kit, I need, is a BH 4974. However, I am having trouble finding any information or drawings on the BH 4974 kit. I know that the B3200 is the replacement tractor for the B7800 and it calls for the BH 4984 subframe kit. Does anyone know if the 4984 kit will fit the B7800 tractor? or, does anyone know where I can purchase a BH 4974 kit ?