Also, those Kawasaki Mules that have the two cylinder engines are subject to their push rod bending, that also could cause the engine not to start and or running poorly.
The rear seats are Wise Industrial Universal Folding Forklift Seats (Black, Model 1745P) that I purchased from Northern Tool. Unfortunately, they no longer carry them, but you may be able to source them elsewhere. I made brackets that cradle the seats and attach to the tube rail along the bed so I can easily remove them when I need the cargo space.