Ok I got it working (so it seems, I haven't tested the actual
configuration part since both of my 3c509b's are online, but it detects
the cards just fine).

For the original 3c5x9utils source:
http://invisible.yi.org/~jmcneill/3c5x9/3c5x9utils_1.1.orig.tar.gz

My patches:
http://invisible.yi.org/~jmcneill/3c5x9/3c5x9setup.c.patch
http://invisible.yi.org/~jmcneill/3c5x9/el3.c.patch

Have fun, and if anything blows up, don't blame me :-)

Jared