For a service call in Royal Palm Beach we carry extension springs and the pulley and cable hardware that goes with them, since that's the dominant setup in houses from this era, along with torsion springs for the newer builds mixed into the same neighborhoods. We stock standard chain and belt drive opener parts, safety sensor kits, and the common gear sets that fail in mid-life openers.
What we don't carry as standard stock are parts for openers old enough to predate current photo-eye sensor requirements - those sometimes need an order, and we'll tell you at the door if that's the case rather than make you wait on-site. With roughly 13,742 households in this part of the service area, the volume of 1980s-and-90s-era doors we work on gives us a good sense of what breaks and when, even without a depot here.