My pleasure. 
I don't think it's applicable to private cars in Islamabad. I think that per seat taxation is applicable at the time of transfer, but I'm not sure.
For 1200-1299cc cars like 1.3 GLi, the total token tax that you have to pay is PKR 3,350/- for Filer and PKR 5,100/- for Non-Filer.
However, for 1501-1599cc like 1.6 Altis Automatic, you have to pay PKR 8,850/- for Filer and PKR 12,600/- for Non-Filer.
I hope it helps.