This is an old thread, and that database file is not updated for 5th gen Legacy models.
I was looking to purchase some aftermarket wheels, so I wanted to compare unsprung weight, etc. I'll share the results of my research here for my 2011 Legacy for future searching prosperity.
2010, 2011, 2012 Legacy 2.5i Premium
Size: 16" x 6.5"
Bolt pattern: 5 x 100mm
Weight: 18.5 lbs
Subaru Part Number: 28111AJ05A