i have the original somewhere here on my bench and a set of digital calipers plus several sources on the internet give the size as well. 2mm is too thin and works only as close up. it sits in a rubber cradle you might say and is a little big, so height and with aren't so much the issue. its as thickness. indeed when i first found a piece of glass to experiment with it took several attempts to get it right i expect the same when i find a piece of glass the correct thickness. the nikon 950 no longer serves as my primary camera and its well out of warranty. it has good sensitivity to inferred which is why i have pulled the hot mirror out and wish to replace it with clear glass. i would consider two pieces of 1.25 thick glass and sandwiching the inferred filter film between them but that would make the camera full time inferred and i kinda like the option of using it with out the filter at times.
with and without a filter
http://i.imgur.com/7Ov1aXL.jpg
http://i.imgur.com/m66FmGL.jpg