I have this 1973-74 E-body transmission crossmember that I would sell for $79 + shipping.
If you are looking for a mint one, then the one I have is about as good as they come.
FYI, there is difference between all of the Cuda and the Challenger side glass stainless trim pieces.
You will need to research if any pieces interchange between the two models.
Not surprised to find examples of the earlier style weights on 1970 models.
This might be some sticker shock, but I just fond this on ebay.
https://www.ebay.com/itm/203746860454