When I was making my FEL dolly, I needed some edging for the 1/4" steel platform where the FEL parking stand would land. It was simply to protect the paint edges since this thing sees rough duty. I found a product on Amazon that I liked. It was about a dollar per foot, which was not bad. However, the minimum order was a 25 foot roll. I passed at the time.
About 2 weeks ago I hit my head for the 4th time on the protrusions on the ROPS. I think 3 of the times I was looking in the tool box. The other time was on the opposite side when I was checking the hydraulic fluid level. I thought that maybe this edging could help reduce the sharpness of these protrusions. And the price was looking better and better.
This edging is tough. It's reinforced with aluminum pieces on the inside. A bandsaw would be nice for cutting it, but I managed okay with tin snips and an end nipper for trimming. Its curvature from being rolled up actually helped in this installation. The shape of the ROPS protrusion was close to the natural shape of the edging coming off the roll. I had to hammer it on with a plastic mallet. The fit is very tight. I don't think it will come off in normal usage, but I'll update this thread if I have problems down the road. Note that I don't have to lower my ROPS to get in my garage. If you must do this, this edging will not work for you, since it blocks the normal movement of the ROPS in several ways.
This edging is not a perfect solution. It doesn't offer any padding to cushion the blow. But it's much wider than the 1/4" steel and doesn't have sharp points, so any blow is more distributed and flat.
The other possible solution I considered for the ROPS was to buy a couple of those Styrofoam covers that they sell for outdoor faucets to keep them from freezing. You could put the covers over the ROPS protrusions, maybe paint them. It wouldn't look as good as the edging but would provide more protection. This idea will seem even better after a couple more klonks on the head.