We carry the parts that match 2000s-era residential doors because that's most of what's on the trucks for a Spring Hill call: torsion springs sized for standard 7-foot and 8-foot sectional doors, steel rollers, extension and torsion cables, and openers compatible with the safety-reversal and photo-eye standards that were already in place by the time these houses were framed. We don't carry parts for pre-1960s one-piece doors on side-mounted track, because that hardware almost never shows up out here - it's the kind of thing we stock for older pockets of the service area, not for Spring Hill. If a part turns out to be something unusual, we'll tell you on site rather than guess, and in rare cases that means a short wait while we order it in rather than a same-visit fix.