I think there are 2 different steering wheels for the 68 Chevelles. Check the auction link below and see if that is the one you need. That auction has ended already. That steering wheel was used on some 68 Chevelles, Novas, Camaros and Impalas. 68 is the only year it was used. I have been looking for one for my car for several months. An uncracked one will be very hard to find. I just bought a cheap one that I am going to have restored.
James
1968 Steering Wheel