Difference between XU3 and XX7

[Wombat7051]

I think this may be how and why this question came about.

http://www.ebay.com.au/itm/Holden-HZ...item4d2cc9c82b

This van is very original and has been in storage for the past 6 years. Factory 'Dynasty Gold' L32 high compression 253 V8 with matching numbers.Original GV7 Salisbury LSD with 3.55 gears.2 seat capacity. The engin was rebuilt approx 140000 km ago. An auto transmission was installed when the engin was rebuilt.The XU4 is rarer than the Sandman. This vehicle is intact with all its original Monaro running gear and factory GTS detail. The vehicle requires restoration but it is complete, does run and sounds great. This is extremely rare and its true value is in restoring to complete factory condition not mocking it up with Sandman stickers etc. The only physical difference between this and the Sandman was an 'N' instead of an 'M' on the Id tag.The original Nasco coffin rails and luggage strips are intact and sturdy. This was released as a true Recreation vehicle. It still cuts an imposing figure. The vehicle is for sale. The reserve is very reasonable. You can see a short video of the car running here >>>
http://youtu.be/crtWs-7afzA

$_57.JPG

$_12.JPG

Being that it is a Brisbane build (H4) should it not have xu4 on the plate?