I think it has to do with whether your car has A/C or not. With A/C the belt will be longer. Since A/C is an option (people in Canada and northern Europe not always springing for it) it makes a difference which belt you get. Be aware that on some models (my 97 R and GLT), Volvo changed the configuration of the belt. The new configuration is just a smidge longer than the original. Instead of going around the alternator and back up it goes down and makes a 90 degree or some such change. The very important point to remember in changing the serpentine belt, is which pulley you slip it over last. There were a lot of posts about people swearing up a storm and trying to stretch the belt a sixteenth of an inch, etc., to get it to slip over that last pulley, but when you install it, make note that all the pulleys have a tiny flange on them. The idler pulley on the inside does NOT. It's smooth shouldered. Thread the belt around the bottom, around over the top, and then make your little loop and slip it over the inside shoulderless pulley. You won't have any problems. If you get your belt and there's a drawing inside, it's because Volvo changed the route the belt runs. You can tell, because if you install a new belt and then release the tensioner pulley and the belt is still loose, it's because you installed it the old way. Dick