Plain steel rollers as standard
That matters for rollers specifically: builders in the mid-80s were still spec'ing plain steel rollers on steel track as standard, not an upgrade. If your door has never been touched, there's a good chance every roller on it is the one that left the factory with the house. We carry nylon rollers with sealed ball bearings as the standard swap - 7-ball and 10-ball stem lengths cover almost every residential track we run into in this area.