the Italeri kits are Chevrolet while the Tamiya kit is a Ford.
The Tamiya Ford Quad kit is still readily availiable here in Oz. Try Hobby HQ in Melbourne. I find this kit is more 1/32 in scale and it does contain a lot of inaccuracies but mainly in the chassis and interior
TheItaleri kits are not readily avaiable here. Still a lot availiable in Spanish model shops though according to a friend of mine and I purchased my last lot from an American Model shop through a friend but with the exchange rate and post it worked out rather expensive but I did end up with a couple which made up into an Australian Pattern ambulance and a nice Australian type15cwt. I purchase the kits when ever they become availiable and I have the funds to pay for them. Sorry I have no spare ones at the moment.
Below are three photos of an Australian Pattern tipper I have not quite finished. This is the first one I have done as a diorama. The wheels are off a Tamiya GMC kit and the Italeri 15cwt kit which was used as a base was sent as a gift by a friend in the US. He knows who it is so I will not mention his name but I thank him for it again.
I also did all the tipper gear as well.
Cheers
Cliff