The '90-'92 were cast aluminum and '93-'96 were cast iron. The cast iron units don't weigh 25lbs a piece! I know this for a fact, because I have a brand new pair of cast iron TT calipers from Nissan and I just weighed them in at 6lbs a piece. And yes, they are cast iron, because a magnet won't stick to the aluminum ones. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>
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