A random thought, based on 15 years as a crew chief and owner/crew chief on champ karts - get one made by the kart manufacturer or an aftermarket manufacturer, your choice, and make sure it is properly mounted. If you are worried about the weight of different champ bodies, diet off 2 pounds - that should more than cover the range between heaviest and lightest. Get the one you like the looks of best, or the one that looks to you to be easiest to mount (hard to get easier than mounting champ bodies and side panels). Body weight isn't really a big item on champ karts. Just my thoughts. Good luck with your racing.