Most of Benton's housing stock dates to around 1983, which means a good share of doors out here are still running on whatever track, rollers, and hinges came with the house. When a door jumps track, the fix depends on what's actually bent or worn, not on a one-size part.
We carry replacement track sections (both the vertical and the curved horizontal piece, since a hard jump usually bends one or the other), steel rollers to swap out the nylon ones that have gone brittle after four decades, hinges where the roller stem has worn oval instead of round, and lift cables when the off-track event snapped or frayed one. If the bottom bracket tore loose from the panel, that's a separate repair and sometimes it means the panel itself is done.
What we don't stock on the truck is anything specific to a door model we haven't seen yet - some builders in this era used hardware that isn't a straight swap, so on an older Benton door we sometimes have to look at what's on the wall before we know exactly what's going back on it. That's not a delay tactic, it's just how 1980s hardware works.