Cars with the same dash:
1982-1986 Bonneville
1978-81 Lemans
1978-87 Grand Prix
You can search here for parts in your area. Dashes are difficult to ship.
http://www.car-part.com/
You can look here for aftermarket parts, but you'll have to search under Malibu. Some parts interchange, but not a lot.
http://dixiemontecarlo.com/