Large stay rollers for barn doors

My barn builder did not want me to use garage doors for my barn as I’d planned, because we ended up putting in a tongue and groove ceiling and it would ruin the look. So, he built me a beautiful set of barn doors. The problem is, they’ve swelled a bit, and no longer work well with my Stanley 3.75 inch barn door rollers. Does anyone have a source for bigger ones? I’ve looked all over, and can barely get my doors open. TIA!

Hmmm… does anyone use a door guide on their sliding doors instead of a stay roller?