Get them right from your dealer. As far as the slow leaks, Yea, I had them too, both of my Cubs and then my Bota. Had enough of that, so I had them filled with Agco's Soft fill, which has the consistency of Gel. No more leaks, ever, and still have as good a ride as I had with just air. I HIGHLY recommend it. You wont' have any more leaks and wone have to worry about peeling the tire of the bead when doing heavy FEL work.... If I remember right, both fronts were filled for about $120 total...