...just do what I did. Order a Timber Wolf, and pick up the parts you need along with it from IWM's store. In the case of my 'D', I ordered the Timber Wolf, four Hellbringer SRM packs, two Loki arms (one right, one left, obviously), and used those in place of the original arms/missile pods. No reason to have specialized variants in packages when it's that easy to build them oneself.