A-Body Fenderwall Headers...what brand do I have?

Anybody know what brand of SB fenderwall headers these are? Can anyone tell if they are early a-body specific or fit all years? Can’t see no brand marking, just has 741 R and 741 L on the flange that bolts up to the head. I got these with some early 64-65 Barracuda parts, thanks! :thumbsup:

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