You won't want "original" stickers, as the shelf life for a 1970 sticker is long past. If you have a graphic of what they look like, most good sign shops that do vinyl can reproduce them.
Ditto the sign shop idea.....check around and you'll probably find one that has the graphics you need on file if it is at all popular.<br />If not, they can make any multicolor design you need from a pic.