I had the doors replaced and quite happy with them. I, too, have Imperial measurement cupboard doors, not metric, but the doors were manufactured to fit. If thethe cupboard carcasses are solid and sound it would be a waste of money to rip them out. There are several door replacement companies who make them to measure. I used Kitchen Magic, but Dream Doors are also a national company.
I've got another 'keen'... Ouch!