Re: Where to find replica placards???
Here's an off the wall idea...make them yourself. Happen to have a printer handy? How about something like Microsoft Word? If so, here's what I would do...buy some waterslide decal paper that matches your printer type (ie. laserjet or inkjet). Print the required artwork onto the decal paper and set the decal on new material. I'd clear coat a couple times, LIGHTLY, with a gloss clear coat to give it water resistance and you're done.
If you don't like that approach, I'd wager a vinyl sign shop could come up with something for you too...for a price of course.
Gives you a little latitude with the verbage so you could personalize it to "tonynoriega2's Alumacraft" or whatever your taste may be.
Like I said, just an idea.