I've been digging around for a few days now, and it seems like I can't find a straight answer. I found some pointers, I guess? I'd like to add reverse to my sled. Back can't take moving it around anymore. I went on fleabay and found a 03 600 classic with the perc reverse CDI (# 2202323) and a NOS wiring harness listed to fit an 03 prox 600, and of course the button. Anything I'm missing? Can I swap out the CDI and wiring harness and have reverse? Is there a lot of differences between 02 and 03? I have never done this before. If there is a complete kit somewhere, I'd rather do that, but I can't seem to find one. Thanks!