In the l920’s into the 1950’s cement roofing tiles were popular on better homes. Most of these were locally manufactured but now have been discontinued. Is there some source where they can still be obtained?
Are you sure they are cement and not clay tiles? Many of the molds still exist for both, Luduici in Chicago still makes many styles and will remake those not presently stocked – but for a price. Check the back of an old tile for name and #.