[Closed] POC Iris Goggle lens replacement.

I picked up a pair of POC Iris DH goggles from a mate to see if they would work better than my 100% ones which have a tendancy to slip down even when tight. Having issues trying to sort a new lens as the old one is fairly scratched.
Does anyone know if these goggles come in different sizes as there seems to be a few alternatives online. I can find loads of tear offs avalable but not many new lens available.
Any help would be appreciated , also it needs to be a clear lens as the tweed valley forests seem to be permanently dark all year round.