needing to get wheels for the sc the factory wheel offset are 45mm
saw some wheels but the offset is 42mm what will I have to do to make these work if I can?

 

If they are 18" wheels I would use the factory 45mm offset only. I have had problems in the past with suspensions bottoming out with non-standard offsets.

If you want to go to larger diameters then you will need to search for the proper offset - maybe on tire rack?