Traction bars were only 67. Manual trans cars got 2.
Yep, and that's the simple rule of thumb. There is actually one engine/tranny combo that got no bars (6 banger 1 barrel carb, auto)
There are 2 other distiquishing features for '67 - the unused upper control arm "eyes" cast into the center section and the setup for mono shocks with an alighnment pin in the center of the perches.
You can really prove it by showing him the 2-letter axle codes for the two years from the factory documentation. The letter combos are completely different between '67 and '68 so you could look up the code on that particular rear axle and go "voila".
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI