Mixed opener generations here
Houses here went up mostly in the 1970s and 80s, median around 1978, which means a mix of chain-drive units bolted onto old header brackets, some upgraded once or twice since, some never touched. We don't post a flat number for Damascus because the job depends on what's actually mounted up there - whether the rail is straight, whether the header bracket needs new lag bolts, whether the existing wall console and safety sensors are original or already replaced.