If you need to create different layouts depending on the product category in Magento:-
Add this XML to Category Custom Layout Update and modify phtml file name to suit.
<reference name="category.products">
<action method="setTemplate">
<template>catalog/category/view_Mounts.phtml</template>
</action>
</reference>
<reference name="category.products">
<action method="setTemplate"><template>catalog/category/view_Mounts.phtml</template></action>
</reference>
Easy to create custom views depending on category. Standard file to copy and customise is in app/design/frontend/default/Your_Theme/template/catalog/category/view.phtml