Metalcloak driveshaft question

clg82

Jeep Newb
Hello everyone new to the forums but not new to jeeps. I just installed a gamechanger 3.5" lift on my 2 dr JK Rubicon. I am thinking about purchasing there front driveshaft as well for this lift, but am a little confused as to why they aren't asking for a measurement like most of the other driveshaft companies out there. Any insight would be appreciated.
 
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