i am looking into getting the OEM remote to lock and unlock my doors. but my question is does it matter what year its from? i have found many that are for 2001-2004 and many other years also ones that say they are for civic and element and all that good stuff but my question is will this work with my 2000 civic ex? does it matter what one i buy? they all look the same the basic lock, unlock and panic button on it. does it really matter what it says its for? also programing is easy or hard?