As with most CS uniform items, they had some common features but also many differences for various reasons. Some of these reasons are time period in which they were made, the CS depot who issued them or various contractors differences. I have a couple on this page if you would like to look. http://www.angelfire.com/ma4/j_mayo/csequip.html

A correctly made generic CS kepi will cost between 50 to 100 dollars, depending on how accurate you want it. Contact me off forum and I can reccomend a vendor.