Dewhel Universal JDM Adjustable 1.7 inch to 2.8 inch Steering Wheel Extension Spacer Hub Adapter For Most 6 Hole Bolt Patterns (Black) This Extension is made with two separate hole patterns to suit just about any 6 hole boss kit. This includes SAAS, Momo, Sparco, Personal, Autotecnica, Tornado, Boss, OBA, Isotta, OMP. Supports any other boss kits with either a 70mm PCD or a 74mm PCD. MADE FROM BILLET ALUMINUM THIS KIT INCLUDED A SPACER AND ALL HARDWARE WITH SCREWS THICKNESS:Adjustable-1.7inch to 2.8 inch No installation instruction are included.Professional installation is highly recommended.