Making my own power cord.

RV:

You can get it at Crutchfield:

https://www.crutchfield.com/p_703NRGX210/AudioQuest-NRG-X2-10-ft.html

The three prong plug is used to connect the equipment ground to earth ground and, for ungrounded appliances, to make sure the correct polarity is fed to the appliance. A C-17 plug is used for non-grounded non-polarity appliances so you don't need the third prong.

Here is the C17 female connector:

https://www.stayonline.com/iec320-c17-c21-connectors.aspx

These guys make custom pc's from a drop down menu but not with the C-17. Maybe if you call them they can accommodate you... if not

You will find the conductor wires and plugs here also. Go to the "Custom Power" "Assembled Indoor Power Cords Menu" and you can order it any length with a plug on one end and the other end stripped so it's ready for you to just simply screw the C-17 connector clamps on the exposed ends.