Transformers G1 Blaster shoulder brace piece

I have acquired plenty of Transformers over the years and many are broken or missing parts. I'm new to 3d printing and just now learning Fusion 360.

My G1 Blaster part bot was missing some pieces so I decided to try and make some replacements.

This part goes between his shoulders on the inside. The metal shoulder things ride along this to keep his arms from flopping and it allows the arms to stay in place when you move his arms up.