The main complication on a house built around 1964 is mismatched parts. Thirty-some years of partial fixes mean a spring from one era paired with a track bracket from another, and neither one is labeled with a date. We measure rather than guess, every time, because guessing on a mismatched setup is how a spring gets installed under the wrong tension.
Cold is the other factor specific to this area. Severe winter swings make steel contract and grease stiffen, and on original 1964-era hardware that's usually thinner-gauge than what's sold today, the contraction shows up as noise and binding before it shows up as a break. That's often what gets a maintenance call started in the first place - not a failure, just a door that's started groaning on cold mornings.
We don't do cosmetic panel matching. If a 1960s-era wood panel is cracked and the rest of the door has faded or weathered differently, a single replacement panel will look slightly off no matter what we do. We'll tell you that up front rather than let you be surprised by it after the job.