Actually, the Royal Bobcat Firebirds just had regular 400 emblems. There was another dealer called Myrtle Motors that used 428 emblems on the hood.

There's actually some dispute as to whether Royal Pontiac ever sold a Firebird Bobcat 428 conversion. No examples have ever surfaced. They did a few GTO's.

They did perform Bobcat conversions on 67-69 Firebirds, which was the tuning, rejetting, recurving the distributor, cc the heads, shim the springs, etc., and those cars would have had the Royal Bobcat body emblems installed by Royal.

There were also thousands of members in the Royal Pontiac Club back then, and for a couple bucks, they would send you a catalog and a couple window decals (the little guy running with the emblem) to apply to your window.

If you bought the whole Royal Bobcat kit via mail order, which included jets, advance kit parts, thinner head gaskets, plugs, etc., you also received those body emblems shown above.