[clarkey1984]

The 2 main things you'll need is the harness adaptor that goes from the cars Volvo wiring to the conventional ISO connectors that 99 percent of aftermarket stereos come with, and the aerial adaptor, which again plugs into the cars aerial connector and makes it into a regular push in connector, the harness adaptor part number is autoleads pc2-71-4, I'm as sure as I can be without pulling my own stereo out to check, pretty much certian that's the one, the aerial adaptor is autoleads pc5-89.

If your car has the factory subwoofer then things get interesting depending on whether it has the passive sub and amp or the non passive one, one type works as is off the aforementioned adaptor through the speaker cables, the other type works off a din type connector that plugs into the HU, the later type necesatating further adaptors that plug into that din plug and turn into RCA type connectors, so if you have this type then be sure that your new unit has RCA pre outs, otherwise there won't be anything to run the sub and amp from, the part number for that is autoleads pc9-414.

However, if your new stereo only has one set of rca pre outs you'll need a splitter that goes from 1 female to 2 male connections, you'll need 2 of these, one for left and one for right, the part number for those is autoleads 011m, but do make sure you definitely order ones that go 1f to 2m, and not the other way round by mistake, which i did, twice haha.