Eight replacement parts here suit Wunderlich™ windows, patio doors and screen doors: three adjustable sliding door carriages and rollers at 26mm, 35.1 x 15.6mm and 54.2mm, a 38.4mm sliding door guide, an adjustable screen door bottom guide in a two pack, a 12kg screen door top hanger and roller twin pack, a snail back non-keyed window catch and spring, and a black sliding screen door latch for older units. The mix says what fails: carriages and rollers wear flat first, then the bottom guide lets the door drag, and the catch spring loses tension. Measure the old carriage body before ordering, because the millimetre figure in each title is the identifying dimension and the three sizes are not interchangeable. The screen door parts are listed in 2V and V2 versions alongside Jason™ hardware, so check which your roller runs on.