I found a location that gives some visual reference.
        Go to the Panzer Lehr page at http://www.clark.net/pub/mrhicks1/.
        The Photo Section has a special Hetzer page.  The other page is all
of vehicles kept at the Aberdeen Proving Grounds museum, and are unlabled,
so here is a listing  photos of interest (i.e. photos of vehicles already
posted):
        ABDN4.gif: Hetzer
        ABDN5.gif: Marder III M
        ABDN7.gif: Marder 38
        ABDN8.gif: Panzer I (probably B, I can't see the road wheels on
16-color monitor.)

        Also, the vehicles section has representative photographs at the
head of each section.