Yakima tracks - what size T-nut?

Yakima Replacement T-Bolt with Nut 8880184 - As Shown Only More T-Slot Bolt $ Free shipping T Bolt Eye Nut tie down kit for Rhino Thule

T-BOLT WNUT 4PACK Product Details Product Specs Weight: lbs

yakima t slot adapter T-BOLT WNUT 4PACK Product Details Product Specs Weight: lbs

yakima smartslot kit 2 Shop T Slot Bolts for Thule, Yakima Roof Rack Cross Bars, Platform, Cargo Basket, Stainless Square T Track Bolt Adapter to Secure BikeSkiKayak Rack,