I purchased my USA Spec iPod adapter Fall 2009 from Enfig Car Stereo, Carlstadt, NJ online also can call 201-490-5015.
My car required the PA11-HON adapter ($130 with shipping) plus the Volvo adapter CBP-VOL ($34 with shipping.)My car has the SC-901 with in-radio 3 disc CD cartridge.
The radio is incredibly easy to remove. Just press in on the tabs on either side of the face plate and they pop out giving you tabs to pull on. Be sure your car sits for several minutes with everything turned off especially the heat/AC controls and then remove the negative battery cable.
When first installed, the adapter did not remember or recall where in my playlist I was when I turned the car off. The adapter unit worked fine just seemed not to keep power when shut down such that it would resume at the last song played. I worked with a very helpful tech at USA Spec several times. In the end, for whatever reason, when I reversed my two power wires ie yellow accessory and red battery the problem was solved (red to yellow and yellow to red.) I was sent a replacement unit which did the same. Don't know if this is a quirk with the car radio, the adapter cable or the USA Spec unit. It matters not, as the adapter works great and has for several months. I also installed an adapter in my V70 with no wiring challenges. Both work great!
--
Steven 04 C70 HPT, 04 V70 2.5T Titanium