I have the tool. Well both arrived. The Dorman pulley is the exact same size as my current 94 Z71 pulley. I will contact Larry, I need a measurement.
Which is wrong. It is 6.5"+ as you can see.Dorman says #300-200 = 6.469" diameter
Maybe, then it would be close.They must be measuring inside the outer lip, at the actual belt surface??