Are you looking for hardware support or only IPS signature updates?
For the former, CON-SU1-AS4A40K8 would be the part number. Note the hardware support in this part number is 8x5xNBD. That is what "1" in the "SU1" section and the most commonly ordered option.
For the latter, CON-SUSW-AS4A40K8 is IPS signture and software support only.