I have an old, but very good, Audio-Technica Pro 35x. The windshield had crumbled completely after many years of use and I have been looking for a replacement.
As far as I can see, Thomann is the only place stocking this.
Although I think it is a little pricey for a very small piece of foam, it fits perfectly and my microphone looks like new again.
I would recommend this product for anyone needing a replacement windshield.