Link you provided in original post mentions Yazaki as JDM OEM connector. Try this guy, this link has both Yazaki and Sumitomo 4 pin female connectors that look like one shown on 4zero1motorsports link:
Browse his site, there are many different connector makes and types. I ordered some for my JDM harness from easternbeaver but he didn't have all ones I needed either.
Good luck. Easternbeaver owner does not like to be asked questions about connectors he does not carry, and he asks on his site not to bug him, so its fair. Service is fast and all items were in perfect order though.