A door built when Catlettsburg was going up around 1956 is not the door you'd get today. Most of what's on the street is a single-layer steel or wood-panel door, hung in a standard single 8 or 9-foot opening or a 16-foot double, on steel rollers that were never sealed or lubricated for life. Nobody was running nylon rollers on residential doors back then. The rollers we pull out of these openings are usually the original steel stem rollers or a mid-life steel replacement from whoever owned the house before - plain steel wheel, open bearing, riding a track that's often been reshaped by decades of that same wear. The complication isn't the roller itself, it's what's built around it: track brackets rusted into place, hinges that were never meant to take a nylon roller's slightly different stem length, and in some cases a track that's been bent enough over the years that a straight swap won't true it back up. You're not just changing a part, you're figuring out what the last 65-plus years did to the assembly around it.