not sure if this link will work without being a member.
its from the forester forum when i had my forester i did a similar mod. like someone mentioned here, you can grab a mesh grill from ebay or any audio shop. paid $25 for the mesh and fabricated an awesome grill. link has instruction for all you DIY.
http://www.subaruforester.org/vbulletin/f80/mesh-grill-hella-combo-finally-done-22763/