They might have moved it to a new template, is there any reason you cant/dont want to upgrade to a newer version of vBulletin? Makes things alot easier.
Well I'm brand new to vBulletin and I had originally downloaded 3.5.4. and spent a while trying to get the 'classic' theme that is the default on 2.3.8. And some people from boards with similar layouts told me that version 2 was an easier version to modify.