"Murmansk" wrote in message
...
The lock fits just fine but the issue is the plate that covers the lock,
and the keep.

The doors have rebates on both edges and overlap, the keep and plate are
designed to fit this rebate. I thought I could use the old ones on my new
lock but although the lock has the same basic dimensions the layout is
subtly different such that the old ones won't fit.

When I had this problem, after a lock began to jam and needed to be
replaced, I just used the new striker plate that came with the new lock,
which meant chiselling out a bit more of the door frame to take the slightly
different placement of the "pockets" for the handle and lock bolts.

I never know whether "mortise" should be spelled "mortice" in the UK.
https://en.oxforddictionaries.com/definition/mortise lists both spellings
without any "UK / US" advice. I would tend to think of "mortise" as the
American spelling of "mortice".