G-U was an early entry in the US market. The GU had a unique handle height of 35 inches. FERCO 528 & 635 were used by Atrium Door and Window. Replace with G-U Roller or Shootbolt versions. Ferco merged with G-U to combine their product lines. To insure you select the correct Multipoint Lock please see our Multipoint Lock Glossary Of Terms to better understand the following terms: Handle Height, Backset, Locking Device, Locking Position, Overall Length, Faceplate Width, Deadbolt Throw Articles: Multipoint Lock Introduction GU/Ferco Infosheet.