I saw this link over on TSL
http://www.skandix-usa.com
I knew Skandix sold a lot of parts for our cars but didn't know that much was available in the US nor than they had a US importer. It looks like you can buy some stuff direct from the US importer or order the non-stock items direct from Germany (with a long lead time of course).

Parts in the 99 catalog I saw that are rare and hard to find include:
Windshields
Water pumps and rebuild kits
Front Bilstein shocks
LR tail light lens '77+
Timing chain tensioners
Steering rack boots
Tie rods

There's even more stuff for 95/96es. Of course there's 5 times more Volvo stuff.