It looks like all of the available hitches for your 2007 Volvo XC90 are class III hitches with a 2 inch receiver. This is a good thing, because the class III hitch can handle more tongue weight and stress than lower class hitches. What this means is that having a longer ball mount will be fine.
On the standard ball mount that is recommended for your vehicle, # 2923, the distance from the center of the hitch pin hole to the center of the ball hole is 8-1/2 inches. Since the Curt Multi-Ball Adj view full answer...
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