Sorry, but your 1999 V6 Mustang is not a "Limited Edition" In fact a "Limited" could not be ordered as a V6.
As for the gold emblems, Ford/dealers have been swapping out badges that are gold for years and calling it "Gold Editions". Back in 1996 I looked at a green GT and it had them too.
see
www.mustang35th.com for "facts" on the "Limited"