I know of nothing that can be bought to make 5.01 work. That not to say it doesn't work at all for anyone, but as I said it stopped working for me on the one card that did work on 4.0.2. Be advised and warned that manufacturers often change the hardware chip set but keep the same model number for their cards, meaning that all cards of the same model number don't use the same driver and thus not all are supported, so it's even hard to buy a card when you know a model that has worked for someone else. See the wireless networking section of the wiki, although very few people have made any contributions to it.