I bought the sidecar to match with the CT20S. The sidecar came with no instructions. For example, it doesn't say how the seat should be installed, and I have to improvise to come up with my own solution. I also ordered a back seat. The upper mounting bracket for the sidecar conflicts with the back seat's structure, so they cannot be installed together. I circumvented this difficulty by using a U-bolt in place of the bracket in question. These suggest that the sidecar is not a custom design for the CT20S. You have to be creative and handy to make it work. But once you have it installed, I assure you your kids love to ride in it, and your bike is unique and eye-catcher wherever you go.