A single part covers Victa™ shed doors here: a shed door carriage and roller, listed as replacing Treco™ and Shed Man™ rollers as well, since those share the same fitting. Nothing else on a shed slider wears the same way. The carriage carries the whole door leaf, so the roller flattens, picks up grit and seizes, and the door begins to drag along the bottom track or lift out of its channel while the sheeting and frame are still sound. Because this is a one-part listing, fitment is worth checking rather than assuming. Take the old carriage off, measure the roller diameter and the overall bracket height, and compare the fixing hole spacing against the product images before ordering, as shed carriages of similar appearance are not always interchangeable.