The rear BFs fit in your wheelwells perfect. I have a pair BF drag radials in that size that I will putting on my Duster. Did you put off spring shackles to make them fit? I just bought a set and havnt put them on yet to see how they fit.
That's what I removed from the car was 275/60/15 BFG Drag Radials. But they were a little worn and I am going to do more street driving with the duster anyhow so I opted for the BFG radial T/A's.
And no I do not have offset shackles. My leaf springs have been relocated inbound 3" on both sides.