Motormaster is a heavily modified and repainted Optimus prime. Breakdown is a modified and repainted HotRod. Deadend is a heavily modified and repainted HotRod. Dragstrip is a modified Mirage. Wildrider is a heavily modified Cybertron Downshift (added articulation, reworked head, and modified to allow for combination). All five Stunticons combine to for Menasor, who is also fully articulated! All the combiner modifications were made with an eye towards minimal negative-impact on the individual robots and their alternate-modes.
...............................................................................................................