SGI drive sleds and interfaces?

Looking here: <http://en.wikipedia.org/wiki/Single_Connector_Attachment>, the connector shown in the top portion of the topmost photo, <http://en.wikipedia.org/wiki/Image:SCSIHardDriveConnectors.jpg>, is the one that the Origin 2000 uses. The drives I purchased previously thinking that they would work in my Onyx2 Reality Monster (and presumably the Origin 2000) look similar, but not identical, to the connector depicted in the lower portion of the photo. They must include power because there is no other connector on the drive to supply power, but instead of the smaller connector off to the left, it looks physically very similar to the connector shown in the top part of the photo, only the connector has fewer pins, is narrower and still located in the center of the sled assembly.