NHRA & IHRA require any aftermarket seat used with a roll bar to be properly braced. Now you don't have to accept your seat being permanently attached to the back of your cage and not comfortable in reaching everything efficiently. Retrofit your seat with this adjustable yet solid-mounting support brace. Drill 2 holes into the seat back and with recessed bolts to secure support brace. Drilled arm extensions on brace provide up to 4'' lateral movement. The support brace arms bolt to welded tabs onto the back bar of cage. All hardware included.