This is for a set of 8 rollers in place of (Case p/n F43589 $10.33ea) and 8 bushings in place of (Case p/n F43832 $2.56ea) these parts fit Case 580-C backhoe cab rear window. These bushing are made from brass rather than the stock ones which are made from steel, so they will not rust and lock up.  The rollers are made of black or white delrin which is weather-proof .