Nineties factory layout
That gap matters. A door installed in the early-to-mid 90s is almost always on a factory torsion spring mounted center-over-the-header, not the older side-mount units from the 1960s-80s wave. The failure points are different too: on these doors we see worn nylon rollers, stretched extension cables on garages that got a second spring added later, and openers from that era hitting the end of their gear-life.