Because so much of Oatfield's housing went up around 1976, we keep extension springs, cable drums, and the older style of pulley hardware stocked on the truck for this run, not just torsion springs and center-mounted brackets. A fair number of these doors have been retrofitted over the decades - a newer steel panel door on the original track hardware, or a replacement opener bolted onto a 1970s rail - so we carry both generations and match whichever is actually on the house, not whichever is more common elsewhere in the service area.
We don't stock every obscure bracket ever made. If a house has a genuinely unusual setup - an import door, a custom width, hardware from a manufacturer that's been out of business for decades - that part may need to be special-ordered, and we'll tell you that up front rather than pretend we can fix it same-visit. For the standard 1970s extension-spring setups common in this neighborhood, though, we carry what's needed.