This was a few years ago but neat photos. Especially rare are the Guiberson diesel radial engine powered ones.
http://www.milweb.net/features/m3a1_stuart_tank.php
http://www.youtube.com/embed/meuzLhc0w6c
http://www.milweb.net/features/m3a1_stuart_tank.php
http://www.youtube.com/embed/meuzLhc0w6c