OK. Yeah these are LVD/SE with an 80 pin, not 68 pin connector. I thought they were 68.

I bought an adapter that does 80 to 68 and 50 pin. I'll post the results if it works or not.

I guess I should try 7.5.5 and see how big of a partition I can create.

I read that 7.5.5 supports up to 2TB, but my guess is I'll end up with either 2GB  or 4GB