Nine replacement parts listed here suit Comalco™ aluminium joinery: five sliding door carriage and roller assemblies from 32mm up to a 125.7mm spring and flat roller unit, a 20.3mm bottom guide for screen doors, flyscreen retaining spring clips singly and in a 10 pack, and a snail-back non-keyed window catch and spring. The spread shows where the wear sits. Rollers on screen, patio and shower screen doors carry the whole leaf and flatten or seize first, while the small clips holding insect mesh into the frame lose tension and let the screen lift. Ordering comes down to the figure in each title, which is the identifying dimension. Pull the old carriage out and measure it before choosing, because the 53.8mm shower screen, 61mm patio and 64.4mm screen door units look alike in the hand and are not interchangeable.