If you have access to a scanner you can scan the Dean logo and buy some decal paper from a hobby store and make one yourself. Its pretty simple to use. You buy the paper print it on a ink jet printer and then spray a sealer over it. The logo is then dipped in water and it will slide off the backing paper and onto the headstock.
The other option is to contact an authorized Dean dealer/repair center. They will usually want to see what you are looking to apply it to.