Hi,
I apologize but my initial comment was incorrect, we do provide S parameter files for several P7500 probe tips besides the performance solder tips.
These should be available in SDLA by clicking "De-embed", select "High Z" probe type, select the "Probe" block, click the drop down menu and select your probe model and then you can select the appropriate file according to your probe configuration and tip.
As I said, SDLA should include those files, if it does not, then please email me at afonso.teles@tektronix.com and I will get you the files you need.