The 1961 median build year in Belvedere Park puts most of its garages a generation ahead of the newer construction we see closer to Conyers, where build years run later and double-wide bays are the norm. Here, a single-bay garage on an older torsion or extension spring setup is common, and the original track hardware is often still partly in place even after the door itself has been swapped.
Median household income in the area runs around $68,900, which is part of why we try to be honest about repair-versus-replace instead of defaulting to a full tear-out. A tune-up, new rollers, and a properly matched spring can carry an older single door for years past when a sales pitch would say otherwise - but when the door panel itself is rusted through or the track is bent past straightening, patching it just delays a bigger bill.