Polo eBay finds/marketplace

Fixcraft sell them specifically to add a face cage too, so yes, although you may find it tricky unless you use their face cage:
http://fixcraft.merchtable.com/safety-equipment/face-mask-for-bern-watts-helmet-kit

You may have yourself a sale then - although I'd need to try it out for the size on my head, generally speaking I take a medium for everything.