Yup, I was looking for the light Trev installed on his boat too. The one in your photo. I could not find it and I did buy the "Aqua Signal 25 Masthead Deck 12V/10W Light ASL-234047"
Mine is not an LED light like I was looking for. The Steamer light portion looks like the same bulb, maybe a little larger then the OEM bulb setup that came on my boat. I was very excited when the package arrived, It looked really nice till I opened it.
On opening the clear plastic packaging over the whole assembly I found an issue. The Halogen Foredeck light has no cover.

No cover at all, naked bulb sitting in a reflector set to point down at the deck at about a 15 degree angle. Angle good, naked bulb, not good.
Now the upside, its USCG approved for power and sailboats up to 39 feet. The wiring looks easy. The mounting looks easy. I expect it will be an improvement over my OEM setup.
Drawback, not LED, but it is USCG approved, so I can live with this.
Drawback, naked Halogen bulb 3/4 of the way up my mast open to the elements. I can always lower the mast to replace the bulb but what a pain.
I paid $54.74 for the "Aqua Signal 25 Masthead Deck 12V/10W Light ASL-234047". I also got an LED anchor light at the same time "Hella Masthead/All Round 4" Light HLL-995003001" which is USCG approved for vessels up to 65 foot, for $23.87. I bought these back in September 2010 from JMS Online Marine Supply,
www.jmsonline.net.
I have not installed these yet units. I figure I will rewire all of the mast at the same time. I have the wires and I have the fixtures. I only have one 2 wire water tight through hull plug for the current OEM Steamer light. I am planing on using it for the anchor light as it is a 2 wire setup.
The new "Aqua Signal 25 Masthead Deck 12V/10W Light ASL-234047" is a 3 wire arrangement. It has 2 + positive wires and 1 - negative wire. This will require a 3 wire water tight through hull plug.
I also need to replace my current none connected coax going to the antenna at the top of my mast. Again I need a water tight through hull plug for it. It has one of those 2 headed coax connectors going through the deck hull now. You know one of those male end on both sides, glassed into the hull now. It's a bit corroded so it must be replaced.
What I need is a single water tight through hull plug for all of these wires. While I'm at it I would like this plug to handle my current 5 wire need plus maybe another 4 or 5 wires all in one single water tight through hull plug. I don't want any more holes in my deck unless I have to. I have to be able to unplug my electrical from the mast so I can take it down for trailering.
So who has this single water tight electrical through hull plug for me

I need a recommendation please.
I would have had all this installed by now but I've not found a suitable plug yet. Can't say I've really looked though.
I had not yet truly decided until now that I am going to install this Steamer/Decklight combo. I definitely want it in for next Spring sailing season. Since mine is USCG approved. I will decide after testing if covering the halogen is a good idea or not. Could be a heat issue and that's why they did a bare bulb.
Thanks
Alan