Source for a ssop to dip adapter?
Standard SSOP land pads should fit this device. 8.8mm from the extreme ends of the pads, width-wise, leaves 1.1mm on each side within which to solder, according to your 6mm measurement. The breakout board on Sparkfun's site looks like it has 1.5mm pads, but they just barely start at 6mm apart. These ones from Aries may be a better bet: 


http://www.arieselec.com/Web_Data_Sheets/18036/18036.htm
http://www.arieselec.com/results.php?searchtype=3&amp;partno=24-351000-10
http://www.arieselec.com/results.php?searchtype=3&amp;partno=24-351000-11
http://www.arieselec.com/results.php?searchtype=3&amp;partno=24-651000-10
http://www.arieselec.com/results.php?searchtype=3&amp;partno=28-555000-00