You'll find lots of threads about wheel spacers on here if you do a search. The comments seem to be the same of all models, so don't limit yourself to the Series section.
General opinion seems to be that they will put excessive load on your wheel bearings, but there seem to be a number of other issues, so read carefully before making a decision
Are your lock stops adjusted correctly? Is the problem both ways or only one way, uneven steering is very common on a Series vehicle.