Because so much of Northglenn's stock sits in that 1974-and-around window, the truck carries torsion springs across a wider range of wind and wire sizes than a newer subdivision would need, plus older-style drums and shafts that don't match current one-size door kits. We also carry both original-pattern and modern replacement rollers, since a lot of these doors still run on the steel rollers they shipped with, not nylon. What we don't carry is a warehouse. If your door needs a full panel replacement in a color or pattern that's been discontinued since the '70s, that's a special order, not a same-visit fix - we'll tell you that up front rather than pretend otherwise. For springs, cables, openers, and rollers, the truck's stocked for this housing era specifically, because it's what we see two miles down the road, day after day.