Our truck carries the torsion springs, rollers, and cable sizes that match 1980s-90s door hardware, since that's the bulk of what's out there across the nine areas we cover, Hill City included. Where we run into trouble is older discontinued track hardware or a panel style no longer made - in that case, a full door swap beats trying to source a matching piece, and we'll say so rather than stall the job hunting for a part that isn't coming.
For the install itself, we bring standard-width door sections, insulated and non-insulated options, and the opener hardware to match. What we don't keep on hand is a bin of custom-width panels for non-standard openings - those get special-ordered, which adds lead time we'll flag before you commit to a date.