Bought one of these Chrome Braces last year from WCCC and was warned that perhaps most cougars would need a little help getting these installed as old shock towers would bend in over time. However, once I got home and removed the old stock braces I found this Chrome Export Brace to be a perfect fit. My Cat was straight and never abused, so I can confirm these braces are a perfect fit. 20 minute install time (including removal of old braces).
The best part about these braces, besides their looks is the amount of stability they add to the front end of the car. When cornering hard they prove to tighten up the front end allot. If I had to rate them on a scale of 1-100%, I would say they add about 20% to the car's overall rigidity. A great product for any 67-70 owner to add to their cars.
Note, I scored these braces a 3 out of 5 for correctness as they were not offered on original 67 or 68 north American model cougars. They are simply an upgrade from the original braces that are junk.