If you are looking for WK2 S-Limited seats they will be tough to get as they are export parts that cannot be ordered in the U.S. However, there is a possibility that WK2 S-Limited's will re-appear for Canada at some point, and they are being considered for the U.S. market.
I don't understand the logic behind the S-limited being sold everywhere except the US. Its a beautiful vehicle, its what the Altitude should have been. Not everyone in US wants the SRT. I think it would be wise for the S-Limited to be released in the US I know I would be trading my Laredo in without hesitation!