For a double door built with heavier steel panels, we carry torsion springs rated for that extra weight, not the lighter residential springs sized for a single-car opening. Rollers and hinges from a 1978-era door have usually been through forty-plus years of cycles, so we stock standard steel ball-bearing rollers as a drop-in upgrade over the original nylon ones. The mild temperate climate here means we're not chasing rust the way a coastal service area would - Brea doors generally fail from fatigue and cycle count, not corrosion. What we don't stock on the truck are cosmetic trim pieces or decorative hardware specific to a builder-grade door style from that period; if a homeowner wants an exact match on faded or discontinued panel inserts, that's a special order and not a same-visit item.