Those pictures of the rear brakes look soooo similar to my car trailer brake shoes! Probably not but can't beleive Morgan developed their own rear brake design for the three wheeler when its built in such low numbers.
On another car of mine which had an unusual clutch friction plate, when it wore out, I took the old plate to a company near Bordon who put a new friction surface on it for me. Company now gone unfortunately. Maybe there is a company out there who can reline brake shoes?
There are, but not worth it as new OE ones aren't expensive & don't forget leading / trailing have different thickness linings which a lick 'n stick relining co will probably cock up
