In case you are still looking:
AFAIK I have the first set of Zxx/162 Ice Age rails ever made on my 02 Zxx.
It took him a couple tries to get it right as there was confusion of the mounting position of the Zxx. I didn't realize that the Rev moved the skid mounts back up like before, and he didn't realize that the Zxx had them moved back.
The best way to define the length IMO is to say that from the center of the front arm mount on the top of the rail to the center of the rear axle on mine is 43".
Then from the same front mount to the center of the front tip cross member bolt is 16.5". This length could be a cpl inches longer. As it sits - on the deck - I have 4.5" clearance from the p[lastic rail tip to the tip of the extrovert drive. I have 7 tooth 3" pitch Wahl Bros drives.
I have never stabbed the track, but I have a roller/wheeled "tip" crossmember that I think I may modify to slide in there just fer grins.
I had a local fab shop bend me up a new tunnel with less taper to finish at the tip with the same 3" depth as the OEM would have had. Sure beats tunnel extensions!
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