The Liberty appears to be sold in the US as the Legacy, so I'm going to cross my fingers and send you what we've got. The first image is of the two ECU connectors for the Legacy.
This link is what I use to decode engine and VIN codes:
The second attached image shows the control module location for the Legacy.
I'm seeing a number of links in Google about harness conversion kits. I just can't comment on how good they are.
I've never done a Subaru engine swap, but I can't think of anyone I know that installs them separately.
Images (Click to enlarge)
Thursday, August 27th, 2015 AT 6:43 AM