the Opala was made by GM for the Brazil from 1969 to 1992.
http://en.wikipedia.org/wiki/Chevrolet_Opala
like said it does have the same body style as the opel Rekord from the same time line.
http://en.wikipedia.org/wiki/Opel_Rekord
it was also imported to Austalian as the Monaro for a couple of yrs in the 70's but then became the Commodore.
http://en.wikipedia.org/wiki/Holden_Monaro