Original Randy Smith design. Top covers only. Features a guaranteed fit and are compatible with the very latest breather system (early breathers too). Include adequate clearance for all factory frames. Domestic aircraft-grade billet aluminum alloy, fully machined and polished. Are not subject to the warpage and oil seepage that die-cast imported copies are. The undersides of the covers have been machined for additional clearance which will accommodate virtually any high-lift cam. Polished stainless button-head Allen screws and washers are also included. Made in the USA.