The metal link is a half link used to adjust the track tension. That Argo should have body clearance if the tub hasn’t sagged down onto tires. With new tires you may have to install a full link. I start all track installs at 5 psi and measure the circumference of each tire with fabric tape. Argo recommends installing tires on avenger type vehicles from front , smallest , largest , 2nd largest,2nd smallest. Mainly for body clearance and chain binding. I’ve also seen tires that were overinflated for long periods of time being several inches in circumference larger than when new. You may have to push the body up and brace it to get proper clearance.