We keep common opener boards, standard torsion springs, and steel rollers on the truck because they cover most of what fails on houses in this age range. A door from 1997-2002 almost always uses a standard torsion spring size and a garage-door-specific opener motor, not anything custom, so we can usually finish the repair in one visit without a special order.
Where we run into a wait is on a specific proprietary opener logic board for an older model that's been discontinued, or a non-standard panel size on a door that was a builder upgrade rather than a stock model. That's not common in this part of the territory, but it happens on houses that got a nicer-than-standard door at construction. When it does, we tell you up front rather than guess at a timeline.