AEVs HighMark Fender Flare Kit allows HD Ram owners the ability to comfortably fit a 40 tall tire when used in conjunction with our 3 DualSport Suspension System, Premium Front Bumper and 1710 Katla wheels. For customers who already own one or more of these products and wish to upgrade to a 40 tall tire after pruchasing the AEV HighMark Fender Flare System, we have created an easy way to order all of the components necessary to make your existing AEV Front Bumper or AEV DualSport Suspension System 40 tire compatible. 37 to 40 Suspension Conversion Kit Includes 1.6 aluminum driveshaft spacer and axle relocation kit (only compatible with AEVs 2014+ Ram DualSport Suspension System)Front Bumper Corner Kit for Highmark Flares Includes (2) short bumper corners w/ fog light cutouts (reuses your existing light mount and bezel kit). (only compatible with AEVs Ram HD premium front bumper)1710 Katla Wheels These wheels are specifically designed to accomodate a 40 tire when used with AEVs HighMark Fender Flares, Front Bumper and 3 DualSport Suspension System (wheels sold individually)Please Note: This is only for customers who already own the standard (37 tire) configuration of one or more of these products. These are not complete products only the necessary components to allow the fitment of a 40 tire when used in conjunction with AEVs HighMark Fender Flares.Please Note: This is only for customers who already own the standard (37 tire) configuration of one or more of these products. These are not complete products only the necessary components to allow the fitment of a 40 tire when used in conjunction with AEVs HighMark Fender Flares.