I am wanting to order my tires and tubes and tube liners and running into a few different problems. I am going with bj goodrich 16 x 6.0 tires bias ply and ordering the tube liners. My question is on the tubes I want to go with the correct valve stems and some places I have talked to have a insert for the valve stem to fill the space. I found a few different manufacturers that offer the correct tubes I think. Are our tubes the tr15 stems or tr5 or tr13?