Part Number 3204945 - This bearing is used on the aluminum roller wheel for the IMER MS 750 Masonry Saw movable tray 

This bearing was also used on the plastic roller wheel for the IMER Combi 350/1200 iPower Saw carriage head assembly and can still be ordered but the plastic roller wheels are no longer available as an individual item. You must order Part number 3207525 - which is the complete plastic roller wheel and bearing assembly.  This change was done by the IMER Factory.