I've always ran the EKs but I'm not sure the 530 zzz is still available, could be wrong, but I thought that was an issue a few years ago when I replaced my original. 6 year old thread by the way.
I think the 3D and the ZVX3 are the latest(and replacements for the ZZZ which has been discontinued).I've been running the ZVX2 for the last 8,000 miles and only needed minor adjustment once.
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