Check under and behind the rear seat.
The 1968 Chevelle has been out of production for many years. To purchase a 1968 Chevelle now one would have to meet with a rare car dealer or visit used car dealers and try to fine one to restore.
Night Train to Mundo Fine - 1966 was released on: USA: November 1966 (Los Angeles, California)
Michael R. Fine was born in 1966.
Per Fine Ounce was created in 1966.
Night Train to Mundo Fine - 1966 is rated/received certificates of: Canada:G (Quebec)
Cool McCool - 1966 Fine Feathered Fiends 1-3 was released on: USA: 10 September 1966
You can make it fit, but chances are the wiring harness will be different as well as the length... Especially the length. You can try it if you have one laying around, but I wouldn't pay for a '72 steering column if you are working on a '75 Chevelle. now, a steering column from ANY 1973-1977 GM A-body should work just fine, so if you can't get one from a '75 Chevelle, you DO have other options.
Fine Feathered Finks was created on 1966-01-19.
The fact that it can be hammered into sheets would seem to be the most relevant characteristic in this case.
Blue Lake Fine Arts Camp was created in 1966.
Budd Fine died on February 9, 1966, in West Los Angeles, California, USA.
Eugene C. Eppley Fine Arts Building was created in 1966.