LA Choppers Derby Cover This item fits: '99-'17 Big Twin (Except '16-'17 Dressers, '15 FLHTCUL/FLHTKL) High-definition machining from 6061 T-6 aluminum Bolt-on installation hardware included Made in the U.S.A. NOTE: 06 Dyna Glide and all 07-16 Big Twin applications will require the use of gasket PART #s 25416-99-X or C9997F5.