I have the same sled and was running 1.175" w/o any problems. Now I'm running a 1-1/4 track and was thinking of running 1.375" studs down the middle. With the 1-1/4" track there is plenty of room in the ZX. I think 1.50" studs would be the longest and make sure to keep it adjusted on the tighter end of the spec.
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