Mic Covers Windscreen Compatible with Shure SM31FH SM31 Fitness, PGA31-TQG, P31 Headset Microphone Pop Filter Value Bundle 3-Pack

If you Google the headset model and 'windshield' then there will be plenty of places you can purchase replacements from. A generic windshield may not fit well (i.e. opening too big/small, wrong shape) I found a three pack for the pictured model on Amazon. https://www.amazon.com.au/Voarmaks-Mic-Windscreen-Compatible-SM31/dp/B0FRF1VZMP