To avoid huge expense replacing old kitchen cupboard units I converted three types using parts supplied by Kitchen Fittings. A tall larded unit with inaccessible shelves became a pull out larger unit - perfect but be mindful weight balancing or it tips over and bends top support. Corner unit inaccessible became easy access. Several single shelf base units became sliding shelf. Exactly what was needed. Great quality fast delivery, no problems. (You will lose 10% volume / height with trays and supports but that 10% volume was never accessible in original units anyway, and you can adjust mount positions for tall items)