Oops I am in Lahore so I could not advise you where to buy in Karachi....But if you have any contact in LHR you may find it in Bilal Gunj.
When I had the 88, they told me the price 2000 to 35000 of steering wheel. 3 spoke was the expensive one.
Well you if well maintain your car, your quality conscious then you better spend some money to change the dashboard.
If you are price conscious then you may find some ragzine or leather master to repair your dashboard in auto market but it looks so odd.