If you can provide Diablo a proper sample, they will reproduce the decals, and add them to their catalog.
A buddy of mine has a 1981 CB900F (Silver/blue) and Diablo did not have those decals.
He arranged for Andre to make them, but the tins had to be in his possession for a few months (on hands measuring) He won't take on a job like this if the decals are not in very good shape (almost perfect) He did end up getting the decal set for free for his troubles.
Now Diablo has that set but I think they can't show or advertise those because of copyright issues. If you go on the web site you will notice there are no Honda decals listed.