What wheel is this???????

That same wheel (with a different grip color) was used on Camaro (as stated) but was also used on 68-74? maybe 75? Corvette as well as 68-72 Chevelle Super Sport.

Horn switch is available but in order for the horn to work, the tang on the back of the horn switch would need to make contact with a plunger of some sort connected to a copper plate inside the Mopar column. Mopar colums don't have this plunger/copper plate as you know, they use a spring loaded wheel assenbly instead, and the copper contact plate is mounted to the back of the wheel itself.
The horn button (or cap) is also available, but will have GM Crossed Flag emblems.

Hope this helps. That is one very comfortable steering wheel in my opinion. If I was you, I'd figure out a way to keep it in the car. Looks good too.

George