I found that the Xbox.com gamercard is a little large for my forum and used this code instead.
HTML Code:
<!--Start XBL Gamercard-->
<fieldset><legend>XBL Gamercard</legend>
<div>
<center>
<a href="http://live.xbox.com/profile/profile.aspx?GamerTag=$post[fieldXX]" target="_blank">
<img src="http://card.mygamercard.net/mini/$post[fieldXX].png" border=0>
</a>
</center>
</div>
</fieldset>
<!--End XBL Gamercard-->
It uses the gamercard from mygamercard.net and fits much better for me.
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@atlambros83
It's because you are using the regular postbit which is the horizontal one your running. You will need to edit the postbit template
not the postbit_legacy like the instructions say.