b43 driver

[Van Snyder]

I can't find a b43 driver anywhere.  All I can find is advice on how to
use b43-fwcutter and b43-firmware-install.

I have Scientific Linux 7.2.  The wireless is BCM4312.  I have b44,
which works fine for the BCM4401-B0.

I have also gotten advice to use broadcom-wl, and either wl-kmod or
kmod-wl, none of which I can find.

What do you recommend (other than replacing the wireless network card,
which isn't a card -- it's integrated on the motherboard)?

Thanks,
Van