Is it chopped?
Try Bob's Classic Auto Glass in the vintage parts section of ebay he has lots of old stuff listed. Don't know if shipping across the pond will be cost effective. If the top is chopped, expect to bust a couple curved windshields before you get one cut right...Took me three tries on my brother's chopped S10 (and still had a small run in one of the corners). I have cut a good bit of flat laminated glass with no problems, but cutting curved glass is voodoo.