Anybody running 17" Cobra Bullit rims on a Duster

No worries.

Looking at both of those cars I'd say that those tires won't fit into the wheel wells if either of those cars were lowered the in the back. But that's just my opinion based on the pictures I've seen, I haven't seen either car in person.

If you're planning on lowering the car, and by that I mean having the tops of the tires higher than the rear wheel openings, then the biggest tires I'd run are 275's with the stock spring location, and 285's with 1/2" offset springs. Maybe that's a bit on the conservative side, but I don't think 295's will fit with the 1/2" offset. Not on my '74 Duster at any rate. Maybe you could get away with more on a drag only car, but I'm talking on a street car that sees speed bumps, potholes, steep driveways etc. But that's with a significantly lowered car. If the rear wheel openings stay above the tops of the tires, you can run just about anything.