What are these connectors?
I know this is an old post, however has anyone looked at 3M part P50-030P-R1-EA?

The pitch is not right but the angle mounts match this series.

 

It's likely in the same 3M P50 family https://www.3m.com/3M/en_US/company-us/all-3m-products/~/3M-Pak-50-Boardmount-Plug-P50-Series/?N=5002385+3290316870&amp;rt=rud or similar. A high probability that 3M makes it based on the similarities.