It's the ex-Skybow WC62/63 kit. All around an excellent kit. You'll love it. I consider the AFV Club Dodge kits to be among he best 1/35 softskin kits extant. I used their WC51 as a donor kit a few years back for this:
The HB GMC is a good kit but depicts a rare version only used by Free French forces in WW2 and later, in Indochina.
Engine and drive train for both-- all Olive Drab -- which was the US WW2 standard.