‘32-34 Radiator cap seal?

[Mick Hobday]

           

There are variations in the winged rad caps.
The one on the left, inscribed "Westwoods Patent 43016-" with the pressed steel four twisted leaf clover I believe is the original 1932 Austin fitment (it was on my Oct 1932 car when I bought it in 1965); I believe the other two are later, possibly official Austin issue 1933/34 or after market replacements.  
Note the much heavier casting with much deeper front lip on the Westwood example.