Kirkey's 38 Series Aluminum Layback Seats have a unique bottom design, with mount layback angles ranging from 10 to 20 degrees, and are offered in the following sizes: 14", 15",16",17",18.5" and 20" Big Boy. These layback angles will not raise the center of gravity, and the 38-Series seats are for use in street stocks, IMCA modifieds, limited late models, mini modifieds, dwarf cars, legends or any entry level division vehicle. Each seat is designed with bolt-on rib braces, a welded interior head rest plate, and is made from TIG and MIG welded, .100" thick 5052 grade aluminum. Seats come standard with lap belt openings, double shoulder belt openings and sub belt opening to accommodate all belt systems. Mounts and seat covers are sold separately.