2 bearings: 6205-2RS Should fit in stock DR650 sprocket carrier AKA the cush drive (which only needs one bearing at a time). I have 2 because I have the warp9 sprocket-carrier and it needs 2 bearings, but the stock size doesn't fit (though I was told it would fit). these are about $30 each (see bush-pig link below), selling 2 for $20. https://www.bushpigperformance.com/product-page/sprocket-carrier-bearing-high-performance-kit