Also, if you are really going for the details, there are more than one style clamp being sold as "Concurs" "O.E." correct, etc.
IMO....
Best: Find NOS originals or find good used ones and re-plate/re-use them.
Next best: Buy reproductions from Bill Rolik
www.billrolikenterprises.com. They look identical, correct numbers, etc. but the number stamping is stamped mirror image of the original
Close but different Number stamp than I've ever seen on an original car: ECS
Last: The generic dimpled style (on left in pic) offered by everyone else.