how to align last posts

[nbaphenom]

where it says lasts post and below you see how the sizes are different for different forums i would like them to all be the same .
https://vborg.vbsupport.ru/external/2009/01/35.png

[Dismounted]

<a href="http://www.vbulletin.com/forum/showthread.php?t=156777" target="_blank">How To Change the Width of the Forum List Columns</a>