No, what Marty means, is that the bed has been cut out under the Dually Fender. You would have this gap if you used a dually bed. I dont have a set of SRW wheels laying around to see if they would be too far inside the wheel well or not. Sorry, but what Marty said aboove about the spacer is probably right. You might even take the spacer off the front and move it to the back. That might work.