I've recently purchased an aftermarket wheel (should arrive today) mine came with nothing other than the wheel itself. I have a HKB boss on its way from Japan, a few people recommended them, and it was £27 delivered from Japan. That attaches to the column and the wheel attaches to that. There is a group buy on the go ATM for a quick release, which is also quite slim, which goes between the boss and wheel and I'm sure you get the rest of it. There's plenty of videos/tutorials online to see what to do