Hello Jonathan,
These are the only photos I have on my PC at the moment (I'm sat at work

). The hinge in the photo is the best one, and with a new hinge pin may be serviceable. The others are much worse; the folded parts into which the hinge pin locates are long gone.
The attached photo of reproduction Ford Model A hinges looks quite similar, and may potentially be a basis to start from. The long ones anyway. Does anybody know the dimensions of the Model A hinges?
Thanks,
Owen.