Welcome to the forum.
I suggest you start a new thread making it clear you want a bonnet hinge. Someone must have a spare one.
Oops sorry I can't find mine ...
Later models by the way have two springs. Otherwise so far as I know the hinges are all the same.
Are you concerned as to the colour?
So far as I know hinges usually "fail" by the metal bending. There are some fulcrum points on each bonnet hing that need, a little lubrication occasionally.
Good luck.
Stephen