For a door built around 1983, the tracks are usually still the original galvanized steel, and on a lot of these doors the rollers were never swapped out either - they're the same steel or early nylon rollers that came with the door forty years ago. That combination is exactly what walks off a bent track: worn rollers don't sit square in the channel anymore, so the door climbs the rail instead of riding it.
We carry standard-width steel track sections, roller brackets, and both nylon and steel rollers sized for residential doors from that era. What we don't stock is anything custom - if a previous owner put in an odd-width door or a track was modified for a low-headroom setup, that part may need to be ordered, and we'll tell you that on site rather than guess.