The truck carries torsion springs across the common wire sizes you'll find on doors built from the 1980s through today, standard-drum and double-life versions, plus safety cables, rollers, and the hinges and brackets that wear with them. We stock the lift cables and bottom brackets that fail alongside a spring, since replacing one without checking the other is how a second call gets scheduled a month later. Opener parts are more limited - we carry common trolleys, sensors, and remotes, but a specific discontinued circuit board may need to be ordered, which we'll tell you plainly rather than promise a fix we can't make that day.