The Malibu is a trim level on the Chevelle, the Tempest is the same as a Le Mans/GTO. I beleive that Camaro/Nova from the same years have the same brake parts.
here's the part #s for a '77 Malibu
http://www.napaonline.com/MasterPages/NOLMaster.aspx?PageId=430&CatId=3&SubCatId=13


Bill Burmeister