This Peterson pulley flange is machined from billet aluminum and hard-coat anodized to serve as a belt guide when pressed into the appropriate pulleys. It fits both 1" and 1 1/4" wide pulley widths, is sold individually, and requires re-drilling the access hole after installation. The flange is listed to fit pulley part number 06-1338 for users adding belt guidance to compatible pulleys.
Peterson Fluid Systems Flange Pump Pulley - Single 38T HTD