Hey Andrew,
The Aztecs helmet was "borrowed" from the 'The Hawaiians' in the World Football League section on the Helmet Project site.
You can also get images for the "Honolulu Hawaiians" in the WFL section on the "Helmets, Helmets, Helmets" web site at
http://www.misterhabs.com/helmets.htm.
You can find the Musketeers helmet at the "Helmets, Helmets, Helmets" site. The helmet is for the "Mobile Sea-Pirettes" under the NWFA in the Women's Leagues section.
-TC