Where to buy the Alpha-Delta long black IO mating connectors

I have spent hours trying to identify the part number and/or where I can buy the mating connectors for the 2 long black IO connectors that are on the Alpha and Delta modules. They are both keyed different so I believe that I need 2 different parts.

I am desperate as this is a show stopper for me.

Has anyone been able to find this info? If so please share it.
It would also be helpful if you would share how you originally found the info.

Is there a break out board?
Is there a connector with ribbon cable?

I just purchased a board and if I cannot find the mating connectors I might as well send it back...

Thanks in advance for your help.
Jim