Narrow Dynalite Rear Inboard kits offer complete disc brake upgrade solutions for Winters IRS Quick Change applications used on Street Rods. Based on the venerable Styled Billet Narrow Dynalite caliper, these versatile kits are easily optioned to suit the braking requirements and style preferences for a daily driver or the most discriminating show enthusiast. kit require no modifications for installation, and contain 12.19 x 0.81 rotors, adapters, bolt kits and BP-10 brake pads.