Leaf spring clamps/straps

You're lucky with the Duster rear openings, far, far more room than my 69 Dart. I have 245's squeezed in mine with anout 1/2" to spare to the spring and even less on the inner fender.
They are way tighter, I hated removing the rear tires on my 66 Satellite, I had to jack up the body and let the axle hang down and fight em on and off