Inner slide (some times called a bullet) is compatible with belt channel assembly only. Models include the Overhead Phantom and Legacy opener (models 777, 696, 496) and Genie Stealth, PMX, and IC250 openers. This part includes the bullet retainer (part #28019A).
Inner slide for these models with T-Rail and chain assembly use part #25605R
Part Number: 28018A, 28018, 28019A, 28019