Replacement Stainless Steel T-Bolt for Thule or DeWalt Contractor

Thule 591 Pro Ride Bike Cycle Carrier Rack T Track Bolts with Nut thule t slot bolts Do I need to remove and attach the T-slot bolts every time I remove the rack from the car? The bolts can slide off attatched to the Highspeed just like Thule thule t slot bolts Single replacement Thule M6 x 40mm T-Track bolt for Thule OutRide 561, TopRide 568 and FastRide 564 cycle carriers

thule fietsendrager slot kapot Fits load carrier bars with T-track width 20 mm Replaces standard Thule roof box mounting system with 80mm wide U-bolt Toggle techspec Technical