Set is made exact for 1966 models. Two additional holes will need to be drilled when using on early 1965 models. Additional holes will need to be drilled in the L-Shaped pieces on 1967-68 models. **NOW SEE PART NUMBER IN7751 FOR SPECIFIC 69-70 SETS** For more detailed information, please see the excellent article in the June 2006 issue of Mustang Monthly Magazine. Also see our Blog.