Hi Gene. Let’s keep this research area tidy, and spanners in their allotted draws.
My experience with original XLR parts (my main focus) is, if a part has an R number it is different in some way to general XL production parts. Aside from the short length of the KR short shock absorber in the picture, I noticed that the piston valve has the standard 1.5mm holes drilled through the bottom rim, but it has the added feature of a scallop cut in the leading edge. See close up picture. All the other piston valves that I have, only have 2 x 1.5mm holes drilled through the bottom rim.
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Another feature of the standard XL piston rod is that it has 2 X 3mm holes drilled through the upper section of the rod. I don’t know enough about these piston rods, but this hole-less feature may be a way to identify the race version.
Confirm or reject this information as your investigation unfolds.
Regards Steve