Hi Simon
Here are my hinges – my car is a 1950 French built 11BL
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You can see that on my car they are a dome headed pin and the ends are just hammered over like a rivet. They are 60mm long and 7mm in diameter and as such they are identical to the door hinge pins.
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Chris has these available from our vast selection of club spares
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If yours have had bolts put in I would suggest that you go for the oversize pins.
Cheers
Paul