To convert 2006 or newer Cougar1, 2, CX1, 2 or 2007 or newer Cheetah1, 2. Wheels can be stored upside down on the CTS Versa-wing when not in use. This system is made for the current style CTS Versa-wing with a side push button lock to accept the strolling wheels. Pre-2006 wings require screw on stroller wheels. If you need the screw top (pre-2006) style, please call us.