Missoula's housing stock runs newer overall, built out through the 1990s and into the 2000s. East Missoula sits well ahead of that curve - the typical house here went up around 1977, which means the garage door on it has likely been replaced once already, or never, and either way the panel sections you're looking at are not the same gauge steel or the same section height as what gets installed today.
What we see most on these calls: a dented or cracked bottom panel from decades of plow snow and road grit kicked up off the shoulder, or a top section that's bowed from age rather than impact. On a door this old, the panel that's failing is often the only one that's failed - the rest of the sections still hold fine, which is good news for the repair but bad news for matching. A 1977-era door and a 2020s door off the shelf are not the same width, same hinge spacing, or same stile profile.