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					Originally Posted by RichCam  Hello Mike,
 Measured with vernier calipers - tube outer diameter - 26.9mm - so I would say it is 27mm.
 Upon closer inspection, other than being a bit bent, it is an authentic superstructure.
 
 Let me know if there is anything else that you need.
 
 Regards, Richard
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 Many thanks . That is good news , I can buy 26.9mm gal pipe here , it is a standard size . 

  These days gal. fittings are becoming a little scarce , the plumbers seem to use a lot of plastic pipes and fittings .   
Some details. My C8 as found had the parking lights inside the main headlights , a small bulb in the reflector shell. And, a glass rear window in the cab top. 
I would like to find out how a Canadian bodied Cab 11 C8 ended up here in Aust. Maybe it was a pattern vehicle for a possible Aust. version ?  Would it have been shipped direct from Canada ?  I believe they shipped out a single 15 cwt  Canadian wireless house type vehicle as a pattern for the Aust. wireless van