The Wilwood PolyMatrix H pad set matches the 7420 H fitment and uses Wilwood's PolyMatrix friction material. Supplied as a matched set, these pads are intended for higher-demand street or track situations where PolyMatrix compounds are specified. They provide a direct replacement option for systems calling for the 7420 H sizing without implying changes to caliper or rotor hardware.
Wilwood PolyMatrix Pad Set - 7420 H FSL SL4/6