I've seen pics of a few machines that the upper shock mount failed. Not sure if this was because of a crash or maybe shock mount bolts loose and damaged the mount. Either way it seems like good insurance so I installed them on my machine as well as an A arm gusset kit.
I had my shocks off a week ago and my bolt holes were stretched down a little. I am running exe limit straps so don't know if the leverage from the longer bolt and spacer is part of the problem. I bought that brace and welded my spacers to it.