Difference in left and right hand door mirror reinforcements?

[Some Car Guy]

The right hand mirror I can get, the bracket for inside the door is in back order. These look Mostly the same and would seem to maybe just be flipped? Are they different for the contour or the door top? Thinking maybe a left hand could be used at least for awhile until a right hand could be tracked down. I can’t find any rh pieces anywhere. Any thought from anybody?

right side

1966-70 A/B body door mirror reinforcement Plate RH – The Mopar Shop

left

1966-70 A/B Door mirror reinforcement Mounting plates LH – The Mopar Shop

 

[Some Car Guy]

Two venders have now told me that this reinforcement piece isn’t even a real thing. That no such part came oem.

real head scratcher since they are offered.

 

[440 4 speed]

Two venders have now told me that this reinforcement piece isn’t even a real thing. That no such part came oem.

real head scratcher since they are offered.

I have never seen one on any 66-7 b body, and most were original.

 

[YY1]

My 73 uses similar plates but none of my 66 or 67 cars has ever had one.