FIA/MSUK Seat Mounting KitFollowing an update in the 2020 edition of the Motorsport UKs blue book seat rails compliant with FIA APPENDIX J ARTICLE 253 A16. 2 and MSUK K2. 2. 2 DRAWING K64 are now mandatory. MSUK has offered a grace period in the introduction of these rails but all competitors are encouraged to switch at the earliest opportunity. Kit contents: 2 x 597mm rails CR4 Steel 4 x Weld in bosses EN3b steel M8 threads 4 x Mounting plates CR4 Steel 45mm x 90mm x 3mm 4 x