I believe they are 6" wheels so they would work for dwarfs. I hadn't really thought to offer them on the board since if someone were to pay postage and packing, it would be more than the wheel is actually worth. I have seen them on Ebay for £2 each.. they are really cheap!
However if someone has tons of dwarfs and needs all 7, I could just put them all in a box and they could pay postage, which might be worth it to them. Any takers??