The solution .......
After hours of effort searching google, ebay and contacting suppliers I finally found the rubbers that I were after

. These are now fitted so I know they work.
I thought I would post the results for others to use in the future.
I needed a rubber for the rear cab window (of a cab/chassis) and decided to find a windscreen rubber as well. There are many suppliers of moulded G60 windscreen rubbers on ebay, but I thought I would see if I could source a rubber along with the cab rubber.
G60 Cab Window Seals..jpg
I found an Australian manufacturer of rubber. Ambassador Industries Pty Ltd
http://www.ambassindustrial.com.au/. Under glazing rubber they had two rubbers that I thought could work.
G209 for the rear cab and G309 for the windscreen.
G209 G309.jpg
Ambassador didn't answer my emails.
I finally found
http://ozautomoulds.com.au See under H-Moulds Rubber. They had the G309 on their web site. I contacted them via email and phone and they were very helpful.
They had the G209 even though it wasn't on their web site.
So I ordered 8 m of G209 @ $6.50/m and 8 m of G309 @ $5.00/m. Plus freight of $25 for an all up cost of $117.00. Delivery was within 2 days.
CAB REAR WINDOW
The cab rear window measured 1.178 m wide, 300 mm high and was about 5 mm thick. It had a circumference of about 2.8 m. SO I cut a piece of G209 a little longer that that, fitted it around the glass and the cut it so it fitted exactly. I glued it with super glue. The rubber was just a 'snug' fit, not stretched or too loose.
I fed a 3.5 mm rope into the slot that fits over the cab metal and fitted the glass.
It was a tight fit. It took me about an hour to fit. I found the rope came out of the grove at the top corners and I needed to use a screwdriver to prise the rubber over the lip.
I think the rope was too thick.
No sealants were used.
The finished product was perfect.
WINDSCREEN
I needed an new windscreen (glass). I purchased one from autoglasswarehousebrisbane. Although they say local delivery they deliver to most capital cities via a wholesaler. You just pick it up from them. Cost was $120. Highly recommended.
The windscreen measured 1.430 m wide, 385 mm high and was about 5.5 mm thick. It had a circumference of about 3.6 m. So I cut a piece of G309 a little longer that that, fitted it around the glass and the cut it so it fitted exactly. I glued it with super glue. The rubber was just a 'snug' fit, not stretched or too loose.
I fed a 3.5 mm rope into the slot that fits over the cab metal and fitted the glass.
Fitting was a dream. It worked well and only took 10 minutes.
No sealants were used.
The finished product was perfect externally. Internally the rubber at the corners had a gap between the glass and the rubber. However it isn't noticeable. Maybe this is not an issue with a moulded windscreen rubber.
The cost of my new windscreen and me fitting it was about $150. Previously I paid a professional to fit the same to my other Patrol. The cost was $400.
I can now see why the windscreen rusts out. Both moulds hold water!