We have very old sliders, about 40 y/o. The wheels are long gone and we
haven't been able to find right type. When we had a contractor out to
work on them, they donated a "topper" for one door. It is molded, one
piece, with a rail that looks like a rounded upside-down "U". Worked
fine for a couple of years, but now the door slides on the track. Need
wheels or new door, and we have two triple units, so rather costly to
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