Replacement carriages, rollers and trolleys for aluminium patio and sliding glass doors. Adjustable and fixed carriages in acetal, nylon, brass and stainless steel, sized by overall carriage length so you can match the part you pulled out. Measure the old carriage end to end and match the length — wheel profile and axle material are listed on every product. Not sure which one? Start with the Sliding Door Roller & Carriage Buying Guide.