Hoosier 28". The front of the opening is probably the same between a Dart and Duster. The Dart sweeps back at the rear but clearance shouldn't be a factor there in either case.

I had to bend the front lower corner to insure clearance because it will likely catch under certain circumstances. Sidewall scuffs a tiny bit from the top of the opening. Ride height and wheel offset have an influence on clearances.