Hello, some time ago I purchased what I was told was a RS sub frame and anti roll bar which I never fitted. The only difference that I can see on the sub frame is the hole for the front arm bush is larger, I can measure the thickness of the roll bar and one from a 2.0 and st170 if required. In the end I used the 2.0 sub frame, arms and anti roll bar and it all fitted fine so if you are only using them for a trial fit should be no problem