Thanks for helping out.
I realise I have to find a supplier for those.
I did however find those SATA connectors commonly found on hard drives. Those with both SATA power and SATA High speed data. Those aren’t usable for me though. I’m working on (designing) an internal computer peripheral device that needs/uses other means of data transfer. (Internal/motherboard USB)
I’ve come to a point where I have to start planning a small batch of those devices. While screw terminals worked well for prototypes, it isn’t feasible for an end user design. There I need an easy way to hook up a computers internal power supply (ATX). Those usually come with the connectors whose counterparts are the ones I’ve linked in the original post above.
I suspect I’m not the only one who asks for this kinds of connectors, and I’m kinda surprised that you (DigiKey) don’t have these on stock, nor any available from your suppliers. Are they really that rare?