To install a roof rack on your 1996 Volvo 960, you'd need the following:
Yakima 58 inch round crossbars, part # Y00409 (Includes 2 bars)
Yakima 1A Raingutter Towers, part # Y00101 (quantity 4)
Unlike most roof rack installations, you have a bit of play as far as the bar spread goes. The bars are installed so that their spread (center to center distance apart) is between 36-45 inches apart. Rhino Rack offers the # RMCB02 roof basket, which is compatible with a 25-1/2 to 43 inch bar spread,... view full answer...
Since you say your 1995 Volvo 960 Wagon did not come with a roof rack, I assume it has a bare roof with no side rails. Some wagon models of the 960 came with factory installed side rails that run from front to back on the sides of the roof. I have attached a generic photo showing the difference between a bare roof and factory side rails.
I have attached a link to all of the roof rack options available for your 960 wagon with a bare roof. Of the available options, I recommend the Thule... view full answer...