Does anyone recognize this AMP plug?

I have a project to changeover some power supplies that the present ones are powered with an AMP plug & receptacle- see the attached picture.

I have searched the Amp website & can't find this type. The only markings are "AMP" and the connectors are numbered 1 to 4. It is a molded plastic 4 conductor plug with 2-part boot.

Does anyone recognize this & can provide the part # to find a matching corded receptacle?

Sorry, I cant ID it but it looks "Automotive" if you have a only a handful of those power supplies I would change both ends with something more "Industrial" like you can get from Turck.
http://pdb2.turck.de/repo/media/_us/Anlagen/B2007.pdf

It's not automotive, its 3 phase w/ ground. And my customer wants the option of changing back if the need arises in the future so they would prefer not cutting off the connectors, just mating to them with a corded receptacle to the different power supplies.

I just found out from TE (Amp) this is their High Current Commercial Connector. For a mate you would need to buy for each connection:

1) Plug Housing
2) Strain Reliefs
4) Terminals (for right wire size)