If you strike out with French Lake, there are a couple yards local to me that may have the glass. This would be a fairly expensive way to go, as both yards are known for high prices and I might have to pull the glass myself at the one place. If you really want a gasket too, it would be best to wait till spring and warmer weather so that there's a possibility of saving the gasket.
There's also Vintage Glass, aka Glass Finders. I believe some of our members have used them with success.