Have you tried calling VPI Dodgealum? They may be able to give you the exact measurements fairly quickly. Just a thought. Good luck with the XX2MkII when it arrives.
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Do you know that there is a movable weight on the inside of the arm which is controlled by an Allen wrench adjustment at the very back of VPI arms? What I do is set the weight for the highest approximate setting. To lighten the arm incrementally, insert the proper Allen wrench into the back of the arm and unscrew the weight little by little until you have the downward force you need....very easy.
The O-rings that will work for you are as follows:
-014 1/16" thick (0.489" I.D.)
-112 3/32" thick (0.487" I.D.)
-206 1/8" thick (0.484" I.D.)
-310 3/16" thick (0.475" I.D.)***
Those are very close to the O.D.(within 0.010", except***) of the endstub so you they should slide easily. If you want a tighter fit, just subtract 1 from each "dash number" I gave you.