Thanks for the info!  I can check the bottom of a VT52
to see what's
 there at those dimensions - feet or any corner/edge features.  Anyone
 have a photo handy of the bottom of a VT52?  With a scale ruler?  I
 can take one but it'll be a week or two until I'm in the right place. 
Pic of bottom of VT52 w/ ruler:
https://drive.google.com/a/fritzm.org/file/d/0Bx_zOIQ4Z79ZbVBHa1dYSTlmQzA/v…
<https://drive.google.com/a/fritzm.org/file/d/0Bx_zOIQ4Z79ZbVBHa1dYSTlmQzA/view?usp=sharing>
Thanks, Ethan and Barry!
        ?FritzM.