Moss Motors, Victoria british, Healey Surgeons Inc, & Hemphill's Healey Haven to name a few. Getting the glass is the easy part. The L corner brackets with their odd rusted in screws located inside the frame, & the metal to glass seal are a bit harder.
If I may, I would suggest that you get new glass, L brackets, screws, etc, & have a good glass shop do the installation. Don't get the glass sealing rubber, but let the glass shop provide their own. This would be a good time to replace the windshield frame to scuttle seal & possibly rechrome the windshield frame also. I'm sure that someone in your local area can suggest a good shop.
D