2001 Chevy Tracker, No Horn

[dhe]

I'm not sure when the horn stopped working, as I try to never honk at people. 

I noticed a popping / clicking sound when turning the steering wheel fully clockwise or counter clockwise and took it to my local mechanic.

He said he recommended replacing the clock spring, but couldn't find the part. But put everything back together and the clicking stopped.

As luck would have it the day after I picked the Tracker up, I had an urgent need to use the horn, and no horn. 

I took it back, and he tested the horn (works) when shorted, but not from steering wheel. He said he did a number of test that point to clock spring. 

For a 2001 Chevy Tracker - what would be the correct part number for the clock spring? Is there a source?

I found a long thread from a '96 model, but not sure that applies to the '01.

Thanks for any guidance!