Howdy,
Thanks for writing in. The NSN for the Q5945A is 7510-01-575-0904. You can see details here:
http://www.armyproperty.com/nsn/7510-01-575-0904Based in
this post, NSN
7510-01-546-6425 would probably work too.
As a side note, one way to find this type of NSNs is to do a Google search that looks like this:
Q5945A site:armyproperty.com (Click on this link to see the actual Google search)
You can buy them on GSA
here.
If the item in question does have an NSN, there is a good possibility that it will show up in the search results. You're basically telling Google to look for that part number on the ArmyProperty.com website (which has all NSNs indexed). As always though, if you cannot find it, definitely post to the forums here. We have other ways of finding NSNs.
Thanks,
The ArmyProperty Team