Father-Son 1974 Duster Project

72blu, I have seen you give some great advice on this site, but 275-60-15 does not work on a 74 Duster without modification of some sort. You will cause people a lot of headaches with that advice. 255's maybe but that's really pushing it. No disrespect intended

Hey, maybe they won't work on your Duster. Body tolerances on these cars weren't great.

But they fit on my '74 Duster. I had 12" from spring to quarter flange before I moved anything. I know for a fact that I can fit an 11" section width into a 12" space.

And they fit on this guys unmodified '74 Post your wheel and tire combos.
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And this guy's unmodified '74 Post your wheel and tire combos.
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And this guy has them on a '73 Duster (not any different than a '74 for tire clearance) 73 duster 275/60/15????

And this guy has them on a Dart Sport (not sure what year, doesn't matter, all the same) 275's on a dart sport
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So, yes, they will fit quite a few Dusters without modification. Those are all 74's or 73's too, I didn't even list any 70-72 cars even though they have the same clearance. But there's a bunch of guys with 70-72 Dusters/Demons running 275's without modifications as well. It's always a stretch to say any tire combo that pushes the limits will fit ALL of the cars of that year/bodystyle, and it's certainly possible they won't fit on your car, but they do in fact fit a great many '74 Dusters.