I read the other replies...nothing to take issue with. I got my two replacement arms with new bolts on ebay from fcpgroton.com
For whatever reason, the "buy it now" price on ebay was cheaper than their website price. They were about $130 total for both (yup, only $65 each), including the shipping. I've ordered from them before and last time paid about $75 each. These are aftermarket units that look just like the volvo units. The prior units were scantech made in China, but these latest ones were unnamed, made in Germany.

Following the lead of my dealer from years past...the only time I've had the dealer do one....I did not get my front end realigned and everthing seems perfect anyway. When I had the tie rod ends and struts done last year I had a thorough 4 wheel alignment.
I did my right arm the other day...took one hour and 10 minutes. The car I was working on was a 1999, but came from Seatle...only has seen one year of salt...no problem get the balljoint end off the spindle. You do need to remove the bolt entirely before trying to losen the ball joint end, because as you'll see, the presense of the bolt locks it on...it's not just the "tightening" of the bolt that locks it on.
I'm a bad boy...didn't torque it. If someone tells me what the settings should be I'll do that during my next wheel removal.
I've also replaced these on cars that have been hanging around in salt country for several years...unbelievable how the ball joint end can be relentlously "stuck". Use penetrating oil and stay focused.