Rudy had the front and rear window rubbers (1-piece front and 1-piece wrap-around rear, both with the slit for the stainless trim), but I heard he sold them to Duane Hayes in Peyton, CO. I do not know if Duane has moved them from SoCal to Colo yet, along with the other Willys parts he bought from Rudy.
One piece windshields are part number W-325 and I believe all the NOS tinted ones are gone now, but clear windshields are still available thru places like Iowa Glass and others. Ebay has them often, along with back glass (1-piece small and wrap-around and 3-piece wraparound) as well. I have heard that someone has re-made (or plans to re-make) the 1-piece windshields, but cannot corroborate this.