We carry sealed ball-bearing rollers as the standard upgrade over the plastic ones Lake Elsinore builders used, in both the 7-inch stem length for standard track and the 4-inch for the shorter runs you see on some single-car setups. We also carry the matching hinges and roller brackets, since replacing rollers without checking hinge wear just means you're back out for hinges in a year.
What's not on the truck: nylon-on-steel replacement rollers. We don't stock the builder-grade part anymore because it's the thing failing in the first place, and a sealed-bearing roller costs little more installed. If a homeowner specifically wants a like-for-like plastic roller, that's a special order and a second trip - we'll tell you that up front rather than pretend we can match it today.