Are you talking about the chrome trim that goes along the front of the vinyl top from one side of the car to the other? If so, then you might check with JC Whitney for a generic chrome strip that can be adhered to the car in the same place. If you want an original piece then I would suggest finding one in a salvage yard. Or you can check out Fusicks.
www.fusick.com
www.jcwhitney.com