At that age I'm doubtful you'll find factory originals. And they would be old, and probably stupid expensive.
If you still have the originals a bus-wrap company can duplicate them for you and install them, or hand them to you for DIY. Probably the toughest part of the whole project is getting the old ones off.
A heat gun and plastic scraper, follow up with prep sol, lacquer thinner, or acetone - graduating aggressiveness, whichever will remove the rest of the adhesive residue.
I'm getting ready to do the same project on my '05. the sun side are edge-peeling and looks like crap. Since I do a lot of computer graphics I can take measurements and do my own layout, send the file to my printer and they'll print them on 3M cast vinyl as used on bus and car wraps. The factory decals are ridiculously priced, I anticipate I can do them for less than half.
I'll be buffing out the gel coat again, if it doesn't come up to a shine I'll be sanding down and clear coating with urethane before the new graphics are applied.