since you are in canada and this is a list for uk cars it may list some cars you dont have and not list some you do but unfotunately it dosent list the 08 sedona but once you have the dimensions this may help you to find some wheels from a breaker
UK PCD Chart @ Bikerlifestyle.co.uk
since the 08 is a 6 stud wheel just measure between two opposite studs (centre to centre) this is the pcd then measure the diameter of the hole in the middle of the wheel
also you will need to know the offset/inset of the wheels (how much the wheel is in or out from the centreline of the wheel
hope this may be of some help
ttfn glenn
from the looks of it there isnt a great deal of choice when it comes to 6 stud wheels (well in the uk anyway) but you may be more fortunate in canada