Had the same exact situation last summer with fitting the hitch with the rectangular receiver on a 960 wagon. I actually got the wrong Volvo hitch for my car (on eBay), but it still fit. A small part of the underside of the bumper was trimmed away and the fit is less obtrusive than most hitches. Before I had it installed, I took the hitch to a neighborhood welder and had him add plates to either side of the receiver to turn the rectangle into a 2 by 2 inch square receiver. Works great and the whole fix was $20 including a heavy duty insert. BTW, everyone I talked to recommended sticking with the original Volvo hitch unit over a Draw-Tite or U-Haul, etc. After seeing the fit and substance of the original equipment, I am sold on sticking with the Volvo hitch. I thought the welder was a better choice than other solutions, because now I can always use a standard 2 by 2 insert, whether for trailering or any kind of bike or platform carrier.