Paul,
I wish there was such a database, it would sure make it easier.
I went with Optronics units (
http://www.optronicsinc.com ), largely because they have detailed dimensions of each of their units online. So I was able to take my original lights off, bring them home, and use them to match the replacements up from the comfort of my La-Z-Boy

. They don't have an online store, but will sell their units over the phone.
One thing to consider is that the wiring harness, at least on my trailer, connects to the tail lights using a 2-way molded connector. Curiously, Optronics doesn't sell their tail lights with a mating 2-way connector; they have them with other types of connectors, but not a simple 2-way. I could have either 1) cut the plugs off my original lights and spliced them onto the replacements, 2) cut the plugs off the harness and spliced the replacements on directly, or 3) buy new plugs to splice onto the replacements. I didn't want to destroy the original lights in case I'd ever have to put them back on, and didn't want to modify the harness. That leaves option 3. You would be amazed at how difficult it is to find a simple 2-way molded connector/pigtail. The trailer shop near here that has *everything* (Croft, Paul) doesn't even have them. I finally found them online. I spliced the pigtails onto the new lights by soldering them, coating the joint in liquid electrical tape, and covering with shrink tube. A simpler solution would be to use butt splices with shrink tube; these units are available at Lowe's. Since these joints will be submerged, I preferred to solder them.
This project also was the perfect time to apply dielectric grease to all connectors, something I've been meaning to do for a couple of years.
Here are the units I used. I ordered direct from Optronics, since none of their online sellers carry any of these units.
Tail lights:
Left side: STL-37RS $34.29
Right side: STL-36RS $31.09
Pigtails with plugs are available from:
http://www.wiringproducts.com./en-us/de ... l#item_666.
Gender of plugs is determined by the brown wire, which is for the tail light.
8" Male 2-way pigtails: $1.09ea.
(1 needed per tail light)
Side markers:
Sides: MCL-95APG $5.29ea.
Winch post: MCL-35A32G $4.29ea.
Note - MCL-35A32G is not listed on the website and had to be researched by Tech Support; additional shipping time may be necessary on these.
Rear identification bar:
MCL-97RPG $16.49
Lifetime warranty - call Optronics if any problems.