XF 1.5 Postbit avatar height

I wonder If I can make the avatar height in postbit just like in the member profiles.

This is the avatar I've uploaded to my account and the way it looks on member profile and postbit is different.

This is the way it looks on member profile;
ExdkKLq.png


And the way it looks on messages;
acwLF3d.png


See the image is more flexible on height in member profiles but it is square in posts. How do I make it just like in the member profiles so it looks longer in posts?
 
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