Rock from the best i remember and i can recheck this with Ken Bost. When industrial(commercial) machines are bought with ROP they(the company purchasing) require them to have the seat belts and they mount to the frame coming through the floor pans. Have seen one or two of these machines. I don't know if the occupants wear them but they are there just the same. I wouldn't wear them. I have yet to see a privately owned machine with a seat belt.
Lewis