Bring the history you actually know

Mention previous roller work, a recent impact or any change in door movement. If the manufacturer is unknown, say so instead of ordering from an approximate photograph. The installed hardware needs identification before a replacement set is selected.

Keep a repairable door separate from a failing assembly

Ask whether the problem is isolated to worn rollers or whether the track and sections show damage too. A limited hardware repair may be useful when the rest of the system is serviceable. A new roller should not be used to mask a larger structural problem.

Define what the price includes

Have the proposal list the roller work, any additional hardware and the operational check at completion. For the Hialeah property, explain how the garage must be secured if parts require a later visit. An appointment does not itself establish part availability.

Your questions

Do I need the original manufacturer’s receipt?

It can help, but bring any readable equipment label or prior invoice you have. The door can still be assessed when historical paperwork is incomplete.

Can old rollers be matched only by their visible diameter?

Visible size is not a complete specification. The technician should select parts suitable for the door and its running hardware.