Derek,
The front radiator cover design is a good ID for different makes.
Most WW2 smaller crawlers had hydraulic blades. Most of the Inters had that nicely curving lifting arm while Allis and Cat went for simpler blade arms. The manufacturers relied on proprietry blade/lifting designs so you will find many different blade systems on the same dozer.
Most of the big dozers had cable lift blades with either an overhead frame to carry the cable from the rear winch or a "block and tackle" hanging from the front of the tractor with the cable routed through pulleys along the side to the rear winch..
Of course many crawlers were not fitted with blades.
The easiest way to tell what you are looking at from photos is: D-4 size engine cover is just below shoulder height for an average man while the D-7 size is well above his head. The little D-2 is about nipple height and the baby Clarkair is waist height.
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