you have to you use the hex mounts (4mm) from the x2. The arms from 2wd and 4WD have the same lenght.
The difference is the angled arm from the X4, the wheel sit more higher, so you have a lower center of gravity- but only used on american tracks or carpet.
On EURO tracks it should be better with a little bit higher roll center, because of bumps.
I tested the 2WD Reedy Race Amezcua setup, the 4WD arms in the X2 2wd, it only work on flat surfaces, I was about 0,8 to 1 second slower as with my personally standard setup - so the Idea was to put the 2WD arms in the 4WD.
I will test it at the austrian nationals next week.
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