METCO 2003-2004 Mustang - Pulley Bearing Cover Kit METCO Pulley Bearing Cover Fits OEM and Metco Motorsports Billet Idler Pulleys This decorative bearing cover is designed to mount over any 90mm or 100mm Metco single-bearing idler pulley. It installs easily using the supplied stainless steel socket head fastener, and serves to protect the pulley bearing from dust and debris contamination. The above picture shows an idler pulley with the standard hex fastener and the same pulley with the bearing cover installed. Kit includes (1) bearing cover with stainless fastener. The bearing covers are available in an aluminum finish (shown).