Adil,
you could be lucky if you try Shershah, but 5 hole alloys, especially Mini size (13-15") would be hard to come by in the regular market.
I know for sure you have lots of choices for Mini alloys here in the UK. Maybe try ordering online if you can't find them in Karachi.
By the way...were you the guy with the '65 VW Beetle Karmann Convertible?! Can we have some pics? Are you interested in selling?
-Thanks.