For roller work we carry nylon rollers in the common stem lengths, sealed-bearing and standard, since most doors from Yucaipa's era used 7-inch or 10-inch stems depending on the track radius. We also carry basic track hardware, brackets, and shims, because on a door this age the roller is rarely the only thing that's worn.
We don't carry every roller size on the truck for every door style. Doors with low-headroom track or odd stem lengths sometimes need a part ordered in, and we'll say so on site rather than force a fit that won't hold up. That's the one honest limit on this job: if your track hardware is a style we don't stock, we tell you before we start, not after.