Factory Modified Upper Control Arm?

Yes, I have 3 NOS one's. I heard that they were modified for big block cars and some where years ago someone had a '67 BB bcuda parts car that had the weldment on both sides.
I've never found any facts to back this up.
At the time and still today I own 5 '69 Bcuda BB cars and one parted. 3 are 383, 4spd notches, 1 440, auto notch and 2 440, auto fastbacks.
Out of all 6 cars, I have ONLY 1 A-arm that has the weldment??????

If your looking to sell the 2 you have, I will buy them!