Here are dimensions for a ALEKO Sliding Gate Hardware Kit with Extension Bracket.
Sliding Gate Roll Hardware Kit
Side Roller with Bracket for Sliding Rolling Gate - 12-Inch
Side Roller with Bracket for Sliding Rolling Gate - 6-Inch
Galvanized Steel V Track For Sliding Gate Opener - 12 Feet
2-Panel Fence Kit – MADRID Style – 8x5 ft. Each
Galvanized Universal Steel Gate Latch - LM191
Dual Swing Gate Operator - GG1300U/AS1300U AC/DC - ETL Listed - Accessory Kit ACC4
Solar Kit for Gate Openers - 60W