Hi, A very quick post to show the connector for STARSCREAM MP44 Head to Starscream Mp11 body You can download the STL file here https://www.thingiverse.com/thing:3941150
Still looks good after all these years... I wish I could just buy head upgrades for the trio. The V3 will probably be over $250.
This one will: Transformers Masterpiece Maketoys Meteor MP11 Starscream MP44 Head *Adapter Only | eBay