I think that GCP has them. Can your Volvo-dealer order parts from them? Our dealers order all older parts from GCP.
GCP has a website where you can order parts but I think that the shipping to USA is very expensive. http://www.gcp.se.
Here in Finland it is cheaper to buy the parts from Volvo-dealer than from the gcp website because of the shipping costs. In Finland all the parts come from Sweden. I don´t know if there is a warehouse in USA?