25 yr old Tricity Ckr integr. 4175 needs hinge repairs.

Almost certainly obsolete. I haven’t been to check it out yet but woman said there was a bang as door fell open and it wouldn’t shut again. Oven working otherwise. I don’t want to send anyone off searching their garage upside down for a part which may not even be there but just wondered if anyone had had any experience repairing broken hinges perhaps using parts from other models? I imagine it will be the pins in the hinge finally given way?
Or perhaps someone has found a work around for this sort of problem?
I think these cookers are a bit wider than the modern ones aren’t they? So it would mean work to modify woodwork etc. to replace it (built-in). Also I fixed elements, cut-out etc about a year ago which involved a £100 bill IIRC, so don’t really want to tell them to scrap it now. On top of all that customers in the 80/90 age group and might not need cooker much longer 🙁 . There again might not need money much longer either :).
Any ideas appreciated.
Mike.