Hello Mike,
here are my answers:
1. You can use any actual Intel Chipset Device Software package ("INF Update Utility") for your X58 chipset mainboard. The newest set is v9.4.0.1027, the latest officially presented by Intel is v9.4.0.1022.
2. If you want to know the latest Intel RST driver for your X58 chipset system, you should tell us, which mode (IDE/AHCI/RAID) your Intel SATA Controller is running and which OS you have installed or want to install.
Regards
Fernando