Three parts are listed as suiting Ullrich® aluminium systems: a 150mm quad roller assembly rated to 150kg, a 90mm tandem roller assembly rated to 90kg, and a multifit non-keyed window catch and spring for the Pentagon 60 suite. Both roller assemblies are also listed as replacing Alspec®, Capral™, G.James® and Vantage™ assemblies, which is common on heavier sliding doors where several fabricators run the same carriage pattern. Heavy glass is what finishes these off — the wheels flatten under load and the door drags rather than glides. Work out which assembly you need by the weight it carries and by measuring the body length of the old one, since 90mm and 150mm are the identifying dimensions. For the window catch, confirm the sash is a Pentagon 60 section before ordering.