[CentOS] 3ware 9550sx on CentOS 4.3 x64

3ware now provides driver disk for CentOS.  A couple of months ago, I
had to add support for the 3ware 9550sx.  The driver disk provided for
CentOS 4.1 work perfectly.

I now need to add support for the 3ware 9550sx for CentOS 4.3 x64.
Although the driver disk is available, it doesn't seem to work.
Anaconda just can't find the 3w-9xxx module.  This is the same seutp
as CentOS 4.1 (which works) so I'm not sure how x64 is different.  The
driver disk contains the following files:

modinfo
modules.cgz
modules.deppcitable
rhdd

Any help is appreciated.