The hub splines stayed the same for decades, but the way the horn button worked didn't. If you're showing the 1941 wheel in your picture above it won't work with your original horn button and your existing column won't except the newer style horn ground plate.
If that's you original wheel shown, it's not that bad. Take a Dremel tool and clean each crack out down to the steel, fill it with Bondo (it remains semi flexible after it sets up), sand it smooth, rattle can paint it with Gloss Black paint and drive on...done in a day. I did my 1935 Chevy Coupe that way in 1980 and still no cracks...
Mike B
