IS there even a "Hallertauer Northern Brewer"?
pretty certain their is. I have seen it a few times before, but yes, just email or call HU.
Found this on HowToBrew.com
Name: Northern Brewer
Grown: UK, US, Germany (called Hallertauer NB), and other areas (growing region affects profile greatly)
Profile: Hallertauer NB has a fine, fragrant aroma; Dry, clean bittering hop
Usage: Bittering and finishing for a wide variety of beers
Example: Old Peculiar (bittering), Anchor Liberty (bittering), Anchor Steam (bittering, flavoring, aroma)
AA Range: 7 - 10%