Purchased new one and where bolt went through old one there is a rivet in this one and can't get over it? Do I just need to drill it out or is there a trick?

Old one where bolt goes

http://img.photobucket.com/albums/v678/pdinkle75/Mobile%20Uploads/20150418_125511_zpsuhhua88n.jpg

new one with rivet?

http://img.photobucket.com/albums/v678/pdinkle75/Mobile%20Uploads/20150418_125452_zpstwrsuuzp.jpg


1964 impala ss
1949 chevy 3100