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Hmm - about to say that there aren't any - but the PL shows them, i don't know where they would fit though as the seal takes up all of the usable space. There should be a generic size available - surprised McMaster doesnt have.
I purchased two of the McMaster-Carr #9540k951 bumpstops for $18.32 (including shipping and tax). I needed to use a larger diameter sheetmetal screw of the same length as old screw, with a small washer. See attached pictures of comparison with old and the final install. The height is 0.750in. old Vs 0.685 new. I am happy with the final results and durometer 60A hardness.