Gilmer Type, 28 Tooth Fits Moroso Racing Vacuum Pumps or similar “smog” pumps that use OE-style, 3-bolt mounting pattern; accepts standard gilmer belts with 3/4" width or less Precision machined from aircraft-quality aluminum with hard-coat anodized finish for extended service life and features direct, bolt-on installation Use with Moroso 3- or 4-Vane Racing Vacuum Pump Nos. 22640, 22641, 22642, 22643, 22644, 22840, 22842, 22843 and interchangeable drive components