Where is the 1995 Volvo CD changer?

My 1994 Volvo's CD changer is mounted in the trunk, under the rear deck, next to the trunk light. It's "hung" from the bottom of the rear window deck frame. It's probably in the same place on yours. I'm trying to find out what brand of cartridge those changers use. I've been told it can be either Pioneer or Alpine, but I don't know and I'm having trouble finding the answer. Is there a brand name on your changers cartridges?