junkyard??
eBay?-
http://cgi.ebay.com/ebaymotors/87-93-mustang-LH-DRIVER-WINDOW-GLASS-OEM-GT-LX-COBRA_W0QQcmdZViewItemQQ_trksidZp1638Q2em118Q2el1247QQcategoryZ33684QQihZ009QQitemZ190207505842QQrdZ1QQsspagenameZWD1V