For a cold-climate install like Richfield's, we stock insulated steel sections rated for the severe winters this area gets, along with sealed bottom astragal and weatherstripping sized for older, slightly irregular jambs. We carry torsion springs in a range of wire sizes because a door replacing a 1959-era original is often heavier or lighter than its predecessor, and the spring has to match the new door, not the old one.
We keep standard 8-foot and 9-foot track and rail stock on the truck for most jobs, but if your opening needs a nonstandard width because of the house's original framing, that section ships from the manufacturer and isn't something we carry as a walk-in part. We'll tell you that lead time before we order it, not after.
We also carry low-headroom track kits, which come up more often on older Richfield houses where the ceiling clearance above the opening is tighter than modern code assumes. If your garage has exposed rafters or a finished ceiling that limits that clearance, this is usually the fix, not a shorter door.