I've never heard of a rebuild kit (Nissan nor aftermarket) for the Nissan spare tire rack and I worked for Nissan for 16-years. As far as body parts, usually a big factor is the size and shipping costs. For used parts, Car-part.com is a good site. For genuine Nissan parts, there's NissanPartsDeal.com and CourtesyParts.com. For aftermarket parts, Rockauto carries some. For either used or new, Ebay is sometimes worth checking out.