What is the height of the ski mount when using the T-Slot adapter?

Mounting single T-slot Yakima attachments to double T-slot Prinsu yakima t slot adapter Yakima SmarT-Slot Kit 5 for TopWater Fishing Rod Box: The Yakima SmarT-Slot Kit 5 is a T-Slot Adapter for use with the TopWater Roof Top Fishing Rod H yakima smartslot kit FYI, I was able to put 8mm T-slot bolts into the tracks for my Front Battery Tender Ring Terminal Harness Accessory Cable

yakima t slot rack Here is a link to the adapter kit Interestingly the rack that goes with these t slots will carry 750 on road and 250 off Seems like I might