ESS .par files

IS there an easyish way of changing ESS iviews (pz02, pz03 & pz13)? I know what I want to do I just can't find the correct HTML templates. Why are these three iViews different from pz50 i.e. there ITS's are hard to find.

Does anybody know where the ESS .par files are stored in the file structure?

Where on EP6.