Tranformers chrome ornament(?) for motorcycle

I am looking for something sturdy to affix permanently to my husband's motorcycle. It has to be similar to the ones they use to say car names like "cadillac" or "harley-davidson", its plastic/metal, but doesn't fade or wash away with time.
I see similar items on ebay, but their decriptions say "decal" so I can't be certain they aren't just shiny stickers.
Will take autobot, decepticon or both.