I just got a gift from the Ehnats the other day: They found an original 1970 vintage Suburban Dodge decal stuck under one of the dealership's step ladders. They were able to get me some photos and I sent them to ECS Automotive (
www.ecsautomotive.com ) and they were able to reproduce it exactly. This particular decal was used by a ton of dealerships back in the 60's and 70's. They can make one for just about any dealer out there. Great people, too. Their phone # is (636) 207-7767. I also sent them the original emissions decal from my 72 Trans Am and they were able to reproduce it exactly and they are now selling them as well. They are known for their 100% accurate Mopar decals but are expanding into GM as well. If you allow them to use your original decal for a pattern, (which they send back to you, of course) you get the new reproduction one(s) for free.
Here's the original:
Here's the finished product on the car: