Correct 340 oil filler cap?

[340wedge]

Does anyone know the correct valve cover oil filler cap for a 340. This would be for a late build 1971 corporate blue engine.
I have seen one with the center rivet with an "S" stamped on it, and another cap that has E/F on the ears. Thank you.

 

[Oldmanmopar]

If I remeber I'll look when I go back out after I eat.

 

[340wedge]

Thank you !

 

[1971 CY Dodge Dart]

 

[340wedge]

View attachment 1716297843

Is that cap original? and would it be natural finish or painted?

 

[1971 CY Dodge Dart]

Is that cap original? and would it be natural finish or painted?

Original to what car? You never mentioned what car this was for. Mine is a 71 Dart. You couldn’t get a 340 in a Dart in 1971 unless it was one of the Canadian built cars.