Hi Bill,
The link you posted are figures from my collection. Most of them are Old Glory figures. The naval figures are from the Mexican-American line. Since the Revenue Service was uniformed as the US Navy, they do double duty in my Mexican-American games as well as the Seminole War.
The Seminole figures in the link are also Old Glory (with an occasional Conquest figure). The separate heads DO have very long stems for necks and do need to be trimmed down to an appropriate length so they don't look like Florida giraffes.
Anything else I can help with, just let me know.