I have an 84r, and from searching around, I found that swinger parts are non existant or very pricey!!! I was looking at my daughters 300ex and it got me to thinkin...would it hurt the carrier if I was to take it, invert it, and weld it onto the rear of my swinger? with a RAD carrier inside it, I dont see how it would hurt it to run with the sprocket on the right side like the 84. If I used say, a rear carrier from a 400ex or 450r, I could then have the option of wider axles, better brakes, different brake rotors,better bearing carriers and so on....what do you think? Would it hurt to run it upside down?