81-258 Metal Wheel or Double Wheel

I have the same roller and it needs replacement. It supports a 60inch x 82inch single pane glass door on metal/aluminum tracks. I have 2 of these rollers at the corners of the bottom and two more at the top corners. I was interest in getting metal wheels or maybe a double wheel replacement to make it easier to open. Thoughts? Options? Otherwise I suppose I'd just buy 4 of these 81-258 because they are identical matchs.