If you go to "Sultaan da Khu" in Rawalpindi, you will find the motors for these cars (cultus, khyber, alto, mehran etc) for Max 3200 Rupees.
Remember: It does not require any kind of alteration! (Atleast in these cars).
I got it installed in two Altos and one Cultus. The price is the same. Even Pajero Mini's steering does fit these cars so alteration ka sawal he paida nahi hota there is plenty of space left even after installation.
It does not take more than 1 hour and don't pay more than 500 mazdoori.
If you go to "Sultaan da Khu" in Rawalpindi, you can confirm both the prices.