It's the black thing behind the hand hold in the first pic. Attached the second pic with the objects circled. Forgot to take a closeup of one over the weekend and now the boat is 2 hours away. Will try to remember this weekend. Click on the pic and you can kind of see them a little better ... they are each held on with 2 phillips screws, and there's a pocket on the lower left. Some have little rubber nubs in them above the pocket, and some don't
Funny you mentioned that life ring holder; I've removed it since the pic was taken ... always got in the way when opening the stb engine hatch, plus it snagged / tore the edging off my cockpit cover.
2003 3300 SE