You can use this to reconfigure a Combiner Wars Brawl to act as a limb of Energon/Classic Bruticus.
To remove the old combiner port you need to remove the two screws from under the chest. The upper and lower parts of the chest can open like clam shell, joined at the waist by a metal rod (which you can choose to remove to make the job slightly easier). Be careful the spring inside the combiner port is strong, make sure it does not fly away.
You would also need the foot adapter to use with Fansproject or original foot accessory.