Wanted: Original fuel tank rollover vent valves

Hi guys,

Does anyone have any original or reproduction of original tank rollover vent valves for sale, or information on them. Most of the cars appeared to have these valves (first two photos), but some of the race cars appear to have had a different valve with a raised up middle, (last photo). Any for sale, in any condition, or information would be greatly appreciated.

Many thanks.
Elliot.
 

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