I have used Eastwood's kit and was pretty happy with it. If I recall correctly, the 67 wheel doesn't have any textrue (pebbly lookin sections) on it, so the repair should be straightforward. My 66's wheel has some cracks in the textured area, and I believe it's gonna be a bear to duplicate it, but sill give it a shot eventually. Anyway, that's the direction I'd go. Especially since you have 4 wheels - you can repair them all, use the best, sell the other 3 and possibly break even (i.e. the Eastwood kit has enough material to repair several wheels).
Different Eastwood kit options on this page:
http://search.eastwood.com/search?w=steering+wheel
As for the horn button, I couldn't finad any at LMC, Brothers, or Classic Industries... Sorry.