From what I've seen the original front hood emblems had metal straps/clips inside with studs attached. These clips were spot welded to the bottom inside lip of the emblem. Is this what you need?

Or are you asking about the side emblems? Hardware store, NAPA, or body shop might have those clips.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-