I did read about spring color codes but didn't find conclusive info on my original question because there are so few sport package xi wagons... However I now know that sedan and wagon springs aren't different, and that my xi doesn't have sport springs. So l may end up with stock or equivalent if I want to maintain original ride height. I still think a heavy duty option would be preferable and may call my nearby specialty shop and ask them for suggestions. I'd like not to buy two more springs next year.