Single-layer steel openings
That era means openings built for single-layer steel doors on standard-lift torsion hardware, often sized for a track and spring setup nobody manufactures the same way anymore. When we quote a new door here, we're not guessing at what's behind the old one - we carry doors in the widths and thicknesses that era of construction actually used, plus the torsion springs, tracks, and openers sized to match.
