Considering how many 100's of systems there must be worldwide it's simply ludicrous that Gunnebo can no longer support the systems. A great opportunity to come up with a retrofit solution !
I hate to see the old cabinets be tossed aside like garbage when parts become obsolete I have many of the safe deposit locks in stock that are currently used in the US if you want to post measurements I would be happy to compare yours to what is available here. I am assuming you don't already have access to the lock measurements used in the US