ONE SIZE FITS ALL! The only barrier you will ever need! Each barrier comes complete with two sets of legs. Use the enclosed short legs if the distance is between 27" to 38" (back seat up, no extensions needed), or use the long legs if the distence is between 36" to 47" (collapesed back seat 1 extension needed or no backseat up to three extensions needed). Made with a low glare black coating this barrier installs quickly and easily with adjustable sides that lock in place and stay secure. No tools needed, extensions sold seperatly.