For all the connectors on American car brands, I usually find more often than not that they have a Delphi/Packard equivalent. In particular, you'll see these parts remanufactured under Motorcraft or [insert aftermarket OE replacement parts company here]. They usually end up building them out as pigtail harrnesses for splicing in... which is why you end up having to go back to the original design by someone like Delphi to get the raw connectors and contacts.
So, in short, I'm putting my money on a Delphi connector. The reason I say this is two fold: connector shape and asymmetrical keying. AMP/Tyco tend to have more square/rectangular-style connectors with less keying and usually the key oriented on the center line of one of the axes... not asymmetrical as shown here.
Not exactly a full on answer, but more of a what I hope will be a push in the right direction.