Richard , you are correct again !
The 1944 C8 model pictured was only ever supplied with either a wood or steel GS body or with a house wireless body . 
The seller has fitted a tank from a 4X2 . 
The price has me shuddering , for that money I could import 3 of them from the UK . They turn up for sale regularly on Milweb . 
There is good website on the C8 GS at 
www.mvt-essex.org.uk/kb.htm
Mike