I think they may fit without trimming actually, terrafirma designed them with a pretty big gap behind the front wheel until the slider begins. I have no idea why, bad design in my opinion, but I'm going to see if I can find the mounting holes on the sport and take it from there. ThanksThe RRS is something like 10cm shorter between the axels than the LR3. I don't remember the exact number, but you should be able to look that up easy enough. If you can trim off one end, you'll probably be ok. But I have no idea about mounting point alignment.