i bought some from antdog/zook. if i would of known what they consisted of, i would of made my own. probally cost $1 to make. next time i pull my front wheel off, i post up the measurments. if i were to guess i would say they are about .100 thick with a hole for the axle to fit through and just small enough to fit inside the bearing seals. look just like a couple washers you could pick up at the hardware store.