If that is a foil type sticker you can get it reproduced rather easily. I had mine done by Dave at ECS Automotive. Dave is always looking for new "old style" dealer stickers and other interesting stuff to reproduce. He is a stickler for exact detail.
I had him do the Suburban Dodge sticker we found on the underside of a ladder. I just sent him a close up photo with a ruler next to the sticker and he was able to recreate it. He ended up just charging me for the regular rate for the sticker and no other R&D costs since he could use the pattern for other dealerships.
http://www.ecsautomotive.com/