Rollers for 2 aluminum sliding patio doors

Each side of the door has a roller-pack that contains only one roller.
I know by now that each roller-pak has a main screw to hold it attached to the door and an adjustment screw.
The doors must be older than 12 years (we moved into this house 12 years ago) The door frame thickness is one inch, the bottom frame thickness may be 1/16" less, and the bottom frame is 2 1/2"