I've seen them in HX and HZ, however I think they have always had GU7 on the tag. HZ and VB were the same when TH350 replaced TH400, ie M41 remained. Features manuals won't be wrong (they can't be), BUT sometimes there are plant to plant variations. So I wonder if Pagewood used up an oversupply of 2.78 gears? This is where most HX and HZ Statesmans came from.