I'm getting around to fix the horn. There is this white plastic piece in the steering column that is broken off. Does anyone know where I can get a replacement? It's circled in red in the photo below.

Looks like the horn contact brush??
http://www.ecklers.com/catalogsearch/result/?search_year=1982&q=horn&x=0&y=0

No, the aluminum part and the spring go inside this plastic cylinder and that's the part I'm trying to locate. I believe it's function is to insulate the aluminum pin from contact to the metal of the steering column. That black plastic part in the link locks the aluminum pin into the white plastic cylinder.

Try Doc Rebuild,he has alot of little parts.

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Try vettsteve@aol.com he is a member that rebuilds c3 he has had about everything I needed and that includes little things like you are looking for.  

I think the little black plastic piece in the brush kit is the insulator...check out the kit #20505 on the Ecklers link...

I just replaced my entire steering column, with a new wheel, horn button, etc - to get rid of slop and some junk Grant stuff the former owner used.  I was able to get everything for it from MidAmerica Motorworks - bit cheaper than Eckler's as I recall, but that piece came with a little horn repair kiit that is sold an MidAmerica. www.mamotorworks.com

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C3: 1979 Corvette Coupe, Auto, L-48, Red/Doeskin (my wife's fave);