ID this trans crossmember, please

I ended up with the top crossmember with some 904s I was gifted. I think it was on a '63 slant 6 trans, but I didn't worry/ pay attention at the time, as I thought it was the same as the bottom one, which came off my '64 V8 Barracuda. Were the really early A body pieces different?

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What I know of 1963 to 1966 has the same cross member.