I ordered the GL1800 rear speaker wiring harness. SKU#AO45180123
The connector didn't mate to what was under the seat. I already had the speakers so I cannibalized the harness, (broke the connectors out of the plastic housing) and made my own connection.
That was in May 2013.
Now either my connections gave out or I just blew up the back set of speakers. I would like to find a harness that I knew actually fit. If I'm going to remove the seat, I would like to use real connectors.