You're right...

No, I don't know where to find them.

In my honest opinion, even if you have Advan and Spoon items, it would be too 'flashy' to put them on.
Check ebay, check with the different JDM enthusiest sites, and check different 4 sale forums.

Best bet is to go to a quick signs, or whatever to get some stickers made, and just have the words on there.

although still, its uber :ghey: in my opinion.