http://www.cousinsuk.com is where I got my acrylic crystal from. I have no idea they sell any domed glass crystals or not.
37.2mm is the size I ordered:
N Sternkreuz 37.2 N372 £1.10
Here is a pic of it installed in the watch:
According to vac, it fit my watch better than some of the others he's tried. The crystal would spin around in the bezel, if you applied pressure with your fingers, but it didn't rattle or move about on its own.
Good luck!