This addon kit includes shoulder and arm replacements to upgrade your Kreon Prime Megatron to be a bit more show accurate. The replacement arms include an elbow joint adding more articulation to your minifigure but will require you to supply a paperclip to be used as the elbow pin. It also has the replacement arm he once sported and experimental new "hands" and "feet" for your kreon. I've included a bonus right arm so you can swap out the "standard" for the "prime" arms and have them painted up differently if you choose to.
Kreon upgrade designer Tresob has created a "wide torso" that will complete this set nicely.