I just checked the 40m's stock of wedged, AR coated, optics in the pull out draws.
It looks like there is about nine CVI W2-LW-1-1025-UV-1064-45P windows: these are 1° wedged and coated on both sides for 45 incident p-pol. Don't think this is what we want (i.e. 45 degree polarized). Also, 1 inch might be inconveniently small to use in practice.
There is one CVI W2-LW-1-2050-C-1064-0, this is the not UV grade fused silica so should probably not be used. Also we need four.
Everything else is either coated only on one side, the wrong type of glass, wedge or coating.