Check out Levergun Leather. I have bought his products, and they are top quality, worth the money, plus check out everything else he offer's!!! Scroll down to find the ones with a cheek rest, and to have bullet loops. You can also have what ever you like engraved one it.
http://www.levergunleather.com/p_buttstock_covers.htm
http://www.levergunleather.com/p_buttstock_covers.htm