Had a similar issue regarding the visor part of vehicle.  Most stores don't have the parts and that makes it frustrating.  You may have to contact the original dealer shop where you purchased the car so they can check if the part is available.  Also depdending on where you live, like with what I had to go with my car window parts the dealer shop did not have it on stock but can place the order.  Other alternate places to check out are automobile junkyards for parts.  Placing and ad to on the n wanted section can also give off clues where to begin asking around.  However the worse case scenerio is if your unable to find one, I end up buying a new model.  Good luck in your search.