This is Brett Green's Tamiya Centaur model. Notice the final drive oil fillers.
Here are the final drive oil fillers in more detail. These are cropped from walkaround photos. I don't recall whose photos these were. They might belong to Alan McNeilly.
Where did Brett get these oil fillers? I do not see them in the Tamiya 1/35 crommwell kits. Nor do I see them in photos of the sprues that come with the Tamiya 1/35 centaur kit, nor do they show in the instructions for that kit.