For a town built mostly through the 1960s and 70s, we carry both 2-inch and 3-inch stem rollers, steel and sealed nylon, because the original hardware on these doors was almost never nylon. Steel rollers are cheap and loud; nylon rollers cost more but don't need the lubrication steel does and run quieter on the same track. Golden Valley's median household income sits at $114,435, noticeably above the $93,233 average across the wider service area, and in practice that shows up as more owners choosing the nylon upgrade over a like-for-like steel swap when we give them the option. We also bring replacement stems, since a worn roller often means the stem bent or the bearing seized first. What we don't carry is custom track - if your track is bent badly enough that rollers keep jumping it, that's a separate repair we'll quote on site, not something we improvise from the truck.