If you're looking for a sliding mirror wardrobe door roller assembly, then you have a couple of different options to choose between. Mirror wardrobe door rollers should fit your structure right in order for it to work properly, however thankfully there are several different models available on the market. At Lowes for example you can find sliding mirror door rollers in brass finish as well as aluminum, so no matter what style you're after, it shouldn't be a problem finding the right one. This mirror door roller assembly for instance is made by Prime Line and features nylon ball bearing rollers as well as adjustable aluminum housing brackets, and would fit great on many different doors. So if you're in the market for a practical set of sliding mirror door rollers, then you should definitely check out Home Depot and Lowes among other places in order to find something that fits your particular needs. 
Prime-Line Mirror Door Roller Assembly
"1-1/2 In. Nylon ball bearing roller. Used by Monarch Door Company for In.500 In. series aluminum frame doors. Housing dimensions: W: 1/2 In. L: 1-11/16 In. H: 3 In. Adjustable aluminum housing bracket" available at lowes.com
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