X7C1K is the Power Interposer Board. That along with cable DRXPD, and plastic holder 4999G Are parts of the Enablement Kit.  The part numbers needed for the Nvidia's are -  K2a (98RCK) and K20a (PVX28)
I have a T630 that I need to connect a Grid K1. The requirement for this came after the server was already delivered, so my sales rep also ordered a power kit to go with the GPU. The kit consists of a cable that has a 6-pin molex at one end and connectors for the GPU at the other. There was also a card included that needs to get power from what looks like a 40-pin connector and that supplies power to the GPU. Question is, what do I plug into the card? Do I need to remove the mobo to get to the PSU?
Connecting power for GPU in T630