Random Question - T-slot Nuts and Bolts

Securely attach a Yakima HighRoad or HighSpeed bike mount to any standard T-Slot equipped crossbars with the Yakima SmarT-Slot Kit 1

T bolt and spacer that the Ski rack mount on to I am going to pick one up today I found a forum where a user said he had to grind the bolts

yakima smartslot kit 2 Replace lost or damaged t-bolts used to secure Yakima universal mounting clamps to roof rack crossbars Works with FreshTrack 4, FreshTrack 6, ReelDeal, and

yakima smartslot kit I have some T-slot style bolts for the front and it seems like that will be easy But the rear looks tricky since the bolt head goes in the