Jim, do you have any cars already completed with the same decals that you now seek?
I ask because forum sponsor LBR helped me out with some perfect, custom made decals when I was searching everywhere, without success, for more Champ Northern Pacific North Coast Limited decals to do another two cars.
All he required were some photos of a car I'd previously done using the Champ decals years ago, along with measurements of the decals in mm's. He also made the ying/yang (?) herald used on those cars.
Quite a few forum members have used LBR for custom decals and been very pleased.