Lithia wouldn't align my car with aftermarket springs to anything but OEM alignment specs (even though they said they would on the phone before I brought it in). I realize your springs are OEM for a Subaru, but just beware. Plus, Subaru's Service Dept. is pathetic...I wouldn't trust them to rotate my tires.
If it's the bolt that stripped, pick up one from the dealer,
www.subarugenuineparts.com or
www.subaruparts.com and give it to the alignment guy or install it yourself.
I recommend C&C for your alignment. Rusty is really good.