Genie GSTB-BX Garage Door Opener Replacement Safety Beam Kit Known As Safe-T-Beam System Part Number 37220R And Is The Same As the Overhead Doors OSTB-BX. Replaces The Older Square Type Part Numbers 20374TS, 27220R, 27221, 34094R, And 35048R Set. Same As Overhead Doors OSTB-BX And Compatible with Genie And Overhead Doors Garage Door Openers That Currently Have Safety Beams Installed.