There are a lot of wheels for sale out there that fit the euro steering column, so be careful to get the spline count on the wheel before purchasing.
New ones are very hard to find these days for the NAS because production is apparently slow and infrequent. I recently bought one from Land Rover Cape Fear after checking with them on 3 prior occasions when they could not get the wheel (out of stock). Their number is 888-355-3847. I will prepare you for sticker shock -- the retail was over $600, but they gave me a slight discount to make it right at $600. Center bumper is NOT included.
The new ones look just like the original but have the microperforated leather wrap on the wheel giving it a thicker diameter and better feel under the paws! Was worth every penny to me -- that nice feel of quality every time I get in the truck instead of my old weathered wheel!