Go to Hamal the Cheiftan, I think he'll give you a new one. Not sure if you have to finish the quest or not to do that though.
Edit: If you're at the part where you get the head then you don't have much further to go so you might as well finish the quest, unless you're not looking to gain prayer experience.
I had the same delima. I actually ended up getting 53 prayer on accident. Honestly..I don't think it's a big deal man but the choice is yours. Although..it might be in your best intrest to get the bear mask as it has pretty good def for a pure item. However, obviously it isn't required.