I would suggest trying to use the HP5384A driver. These two devices are very similar and its possible that the instrument driver is interchangable. Let us know if this works out for you.
http://zone.ni.com/idnet97.nsf/9b2b33e1993d877786256436006ec498/3e3a4ce78bf42f05862568f50000ce56?OpenDocument
I hope this helps out.
-Josh