For a maintenance call on houses from this era, the truck carries torsion springs in the common residential weights, since that's what 1978-vintage doors were built around, along with replacement bearing plates and end cones that match the older bracket spacing. We stock standard-lift cable, since fraying at the drum is one of the first things to check on a door this age, and a range of rollers from plain nylon up, because swapping worn steel rollers for sealed nylon ones is one of the cheapest noise fixes available. What we don't carry on every truck is a specialty opener logic board for a less common brand - those sometimes need to be ordered, and we'll tell you up front if that's the case rather than have you wait at the curb for a part we don't have.