Keith, thank you for that post!
I have an '06 xc90 2.5T with a turbo that froze up. The dealers only option was to replace it for $2500. For a few hundred dollars, I took it to a local mechanic who pulled the turbo, cleaned it and put it back on. It worked, the turbo worked great, however, at a low idle, I would perodically get the white puffs of smoke. Obviously, the seals needed to be replaced on the turbo but I had an extremely difficult time finding a rebuild kit... until I found your post.
I call the G-Pop Shop and talked to Jim. He went 110% out of his way to match the Volvo code on the side of the turbo to a compatible rebuild kit. He found it and my code of 49377-06202 and TD04J14T matched to a Mitsubishi turbo. (makes sense, the turbo on my volvo says 'Made in Japan' on the side).
Here is the link to the page http://www.gpopshop.com/mitsubishikits.html
and it is the "TD04 Complete Rebuild Kit" for $120 plus $12 shipping. Before ordering any rebuild kit, it is best to get the model number off the site of the turbo and have them look up a match.
Thanks again for your post.
Here is there contact info again.