Wow, that's a tough one. I'm not sure, but you can try companies like Erubuni or wings west. Or, watch Ebay or ipd's classifieds. I've found some 240 kits that way, but it wasn't easy.
I also know a guy who found some sideskirts off of a 900 series or something, can't remember, but we're going to feature his car soon. They fit the car, and he pulled some other 900 series stuff for the car also. It looked pretty good.
I believe the 960 had side skirts, and if so, these fit the 700 series. The 960 rear lights (red/clear/clear/red) also fit the 7 series wagon.
The two places I would look at first for a body kit are Brickstylz in Canada and JP Styling in Finland. I've dealt with Randy at Brickstylz and I've heard nothing but great things about Juha at JP Styling. Other souces can be found on my links page below, but they may be more difficult to contact and/or deal with.