Replacement Door Rollers for Sash Windows These are replacement door rollers for sash windows. We recommend replacing them if the sash window becomes difficult to open and close. The old TOSTEM model number for these door rollers is AZWS025. Please use these as replacements. They are for both left and right sides, so you will need two door rollers per sash window panel (four for a sliding window). ※ This is the price for 10 door rollers.