Just out of curiosity do wheels off a 2005 s60 fitvon a 97 850?

 

they will bolt up as they use the same center bore and bolt pattern. The only difference is the 850s use less of an offset ~ 40mm where the S60s use 43 to 49mm. the offset is the different between the wheel's center and the hub's center line - so the difference is about 1/4 to 3/8ths of an inch. Not a problem unless you try to mount up 8 inch rims since that would add another whole inch to the inside and outside clearance. If you stick with the 7 inch rims (ie 16x7 or 17x7 you should be ok for inside clearance.