That's what I get for being a cheapskate:
Arguably, the listing does not specify the orientation of the connector. But the picture on the listing, even though out of focus, still shows vertical connectors.
http://www.ebay.com/itm/131607709750
The seller didn't answer yet, so I still assume it was a genuine mix-up.
[Edit: It was a mix-up, the seller will send me replacements.]
What were your predictable sourcing mishaps?