DOH! I did have them on the wrong side. The thing that got me confused were the bottom holes on the connectors.

On the left connector both of the top holes line up with the top tab on the block and both of the bottom holes line up with the lower tab on the block.

On the right connector both of the top holes line up with the top tab on the block. However only one hole lines up with the bottom tab. The lower hole on the back side of the connector is about 1/2 inch too high.