My parents' hobie cat 16 came with a set of hard plastic beach wheels. The original ones were actually pink (or red and faded to pink), but at one point one of them was replaced with a wheel that is blue but otherwise the same. As far as I can tell from searching online, they are the "blue trax" wheels. The other wheel is now toast and I'd like to replace it also, but I cannot find anywhere to buy just a single wheel. Does anyone know where I can find one?