Hello,
That is an issue with their extension, they should be providing image sizes. A template is not responsible for stylizing third party extension, the extension developer needs to provide that styling. If you can post a url to where this occurs I can see if there's an easy fix, but it's ultimately something that they need to correct.
Hello its at
http://www.wheelsmart.co.za/index.php/suppliersIf it helps the images is the correct acceptable size on internet explorer. The are very small on other browsers.
Thank you.