[jor]

Volvo did provide a parts guide for the dealerships, which is available online, known as volvo vadis. This provides, unsurprisingly, numbers for Volvo parts.
Polybushes, not being made by Volvo won't be included, but any ads or listings that I have seen have stated what cars they fit, e.g look at parts for volvos online.
There are also a few threads on this site discussing the pros and cons of the project, the main cons being the fact that they are quite expensive and somewhat difficult to fit.

jor