Some differences that may help you identify what you have. Kitfox 1 has small doors, and is 36" wide at the top back of the seat. Later models from 2-4 are 39 1/2" wide. Kitfox 1 and 2 have lift struts that measure 98" in length. Kitfox 3 and 4 are something like 10" longer. Kitfox 1,2,an 3 have under cambered wings, and extended rib tails that support the flaperons. Kitfox 4 uses aluminum angles on top and bottom of the wing. That info should tell you what you have... JImChuk