This is the automatic belt-tensioner bracket, which also has a machinedarea for the spacers. There is adequate clearance for the large 8-inchbalancer on both sides. The only concern with the crankshaft pulley isframe clearance when the engine is installed. According to Vintage Air,the crankshaft pulley may be close. We used a torch and a small hammerto place a minor indentation in the frame where the pulley would be.After installation it appeared the indentation was a luxury, not anecessity.