HBA in DS20E

Hi,
 
I'm going to be installing a Fibre HBA (DS-KGPSA-EA) in a DS20E that's
running T64 5.1A PK6.  The documentation says that I need to have the
following:
 
 

*	v5.1A: 
      *  Patch Kit 4 (PK4, BL21): T64V51AB21AS0004-20030206.tar
<http://h18000.www1.hp.com/support/files/index.html> required.
         See most up-to-date patch information. 
      *  NHD6 <http://h30097.www3.hp.com/docs/nhd//>  required. See most
up-to-date information. 



Since we're already at PK6 do I still need NHD6 (NHD6 I believe is older
than PK6)?  How do I tell if I have what I need to install this?

Thanks!
Andy