i found out what they are, they are called "splitters". i would never get one because it is a waste of money for something i know i would break, but my friend still wants one.
they have them at www.extremedimensions.com , look under accessories http://www.extremedimensions.com/shopdisplayproducts.asp?SID=4Honda&id=97&cat=Civic+2DR/4DR/HB+99%2D00&ProdType=Accessories