I have a couple machines that came into our area with the dual straw spreaders. They have the belt driven spreader and look good. They would have to help as much or better than the dual spreaders on R60-70s beings they are higher off the ground. Don't know if there is a kit for the R75 that have hydralic drive but imagine it could be adapted. I got a excess kit that tbran had a few years ago and the guy was going to hook up to hydralic drive when he got time. He liked it the way it was with belt drive.