If you're crafty with tools, you can upgrade to the Hella MicroDE foglight, a 2" round projector foglight that will fit in the 850 round foglight hole. It has a much better pattern than the OEM (also a Hella, but the Volvo kit comes with brackets) - in fact, it may be the best halogen foglight on the market. I use them on my 700/900's to augment the gawdawful lighting that comes on that series. Awesome lights. The tricky part will be mounting them, as you'll probably have to make some small adaptations behind the airdam. (I say that, but in my 700/900's, I can screw the bracket right to the sill in the airdam.) Kit comes with wiring harness, relay and switch. I replace the switch with Volvo oem, and adapt the wiring harness so I can operate the foglights indepent of the headlights. If you're interested, I can send you some instructions.
I get mine from Susquehanna Motorsports ---> http://catalog.com/susq/hella/microde.htm
You can see the light pattern using the 'light tunnel' feature on the Hella website ---> http://www.hella.com/produktion/HellaPortal/WebSite/Internet_en/ProductsServices/ForDriversAccessories/LightTunnel/LightTunnel.jsp, click on the 'Fog' link.
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