You could order them from australia or ARBs retailer in any country closest to PK.
And you should check with Ramy trading in Dubai. They specialise in offroad products n accessories, you name it and they have it! They are close to the Dubai National Air Travel Agency building in Deira which is well knows as DNATA.
Give them a call Tel : 971 4 2698138 Fax : 971 4 2626376. And have you chassis number ready as these guys work professionally! And I am assuming you have you have the original running gear, the one that came with your car.
BTW which diff locks are u gna get? Front, rear or center? or all three?