Replacement Door Wheels for Sash Windows These are replacement door wheels for sash windows. We recommend replacing them if the sash window is becoming difficult to open and close. The old TOSTEM model number for these door wheels is AZWS025. Please use these as replacements. They are for both left and right sides, so you will need two door wheels per sash window panel (four for a sliding window). ※ This price is for one door wheel.