[suicideneil]

Hybrids or UE ultralites, either will do the same splendid job- hybrids would be better for you sinc you have the ofna diffs already. You will need pinions for the diffs (hotbodies sell suitable items, look up their buggy ratio diff parts), and bearings- FLM should list the size required, but I think its 5x10x5 bearings (8 in total required). Some 5x10x0.5 shims will be required also to set the mesh between ring and pinion gear.
Bad news is this means you will also need new center driveshafts or cups atleast if you run dogbones, RCM sell suitable parts in the shop.