Hello Gary,
That’s a great set and rare. The 1933/1934 P56G Motor had the small GILBERT decal on it. I know there are members that make repro decals for the motors, although I’ve never seen one for that motor. Below is a photo of the P56G Motor with a small GILBERT decal on it.
A couple of members that create repro labels is:
Mike Wagner
Greg Briggs
Also, in the back of the club newsletter is a section called, “The Heritage Exchange.” This list standard sources for Erector items, such as repro labels.You could also place a wanted ad on the back page.
Good luck with your project.
Best regards,
Michael