(Can anyone find this part?)
I gathered all of your photos and combined them into one file (below). On the page titled Cisco UCS C240 M4 NEBS Server Service Note I can scroll down to eventually find the exact part referred to as a ‘fixed power input socket’, and possibly identified as UCSC-CONN-930WDC=. The instructions for removing it match with the orange tab on the product, too. I can also locate the power supply product code: UCSC-PSU-930WDC.
I wasn’t able to locate a replacement for this, though, either on our site or elsewhere online, so I posted everything here for our entire department to review. Hopefully, this will be of some help.