Interesting how the drawbar is just hanging there without any support from the back of the case. Not having been around many D2's, is it just the lack of the plates for the drawbar that is making it look odd to me. Or are the finals a none standard piece because of the Trackson modification.
The final drives would be standard, the only modifications to the basic tractor would be the long track frames, hard bar and associated parts, the drawbar brackets would have to be removed to attach the counterweight, but I do not see any provision to remount the drawbar plate to be able to pin the drawbar in the T2 parts catalog. The whole T2 assembly just bolted on to a long track frame D2.
Upon closer looking at the parts catalog, the counterweight may have mounted over the drawbar brackets and not have affected it at all.