@Michael McKelvey My builder is now selling those and I think SE does as well as Lane has one.
I started to look at it and I figured it had to be existing out there. So here is one.. fiat-124-spider-1968-74-
I have not yet found a supplier of NEW parts other than my builder but when I looked at the picture they sent me I just thought duh... that is the original latch with a sprung lever. Who has a 3D printer handy