I've searched the forum and cannot find the answer to the below question. Thanks for any input.

I have a 2003 S-Type Sport. The sport comes with some type of upgraded suspension with CATS. That being said I just installed four Coventry Hornet wheels with 255-35-19's at all corners. I wanted 265's in the rear but the tire company had a heck of a time trying to get them to mount and ultimately didn't. Anyways now the car looks lifted with the big wheels so I need to lower it with new springs.The question is does the sport need the lowering springs same as the R or same as the base model? H&R has two separate part numbers - one for the R and one for the base. Again any help is appreciated.