I bought a tilt column some years from a guy whose company name was GM Tilt. The inside parts looked different but exterior and connections were exact. I installed it and plugged in the wiring, the connector matched, but the wiring was wrong. Turn signals were crossed up with something else. I called him and he new exactly which wires to move. During this I asked where he found enough colunms to run a business and he said he got the colunms from Novas, Venturas, and Oldsmobile Omegas. He said mine was an Oldsmobile unit because of the wiring difference but you would never know by looking. I still have the non tilt original if someone needs one.
