if i remember from my research those wheels are now discontinued, you may try ebay, but they cost a ton.
im building a dedicated driving cab now, it will have xbox, ps2 amd dc. i started with a dc madkatz wheel, it was nice but too hard to mount. so i went with the interact v4 which is much easier to mount but there is a shortage of adapters to go from dc to anything else, so now ive decided to use a ps2 interact v4 with adpaters for dc and xbox. seems to be a good solution. im going to put a 19" or 20" svid tv in there. its going into a gutted turbo cab. my next hurdle is how to mount the pedals so they are more arcade friendly, or switch to a sit down cab