yes the 67 notchback rear window is smaller. but the opening is the same as 68 and 69

I did years ago, I had all 3 year next to each other and did a comparison at my house. Going on memory so I might get years messed up but I will be close.
67 68 cowls are differs for 69
all three year the fire was is different
all 3 years the radiator support header is different
all 3 years the sides of the radiator support are different
I there was something on the 67 in the roof that was different
I think the inside of the trunk the trail light brackets a little different
67 inner fender are different
front license plate brackets is different I think 67 had no slots at the top
69 shoulder belts
January of 69 mandatory headrest
The fastback fold down seat hinge bracket on the seat chrome on 67 and 68 natural on 69 also and the part that screws to the body different one was cast steel and the I believe the other was cast aluminum
seat belts different
hood release different all 3 yeas 67 68 are close but different
68 astray
key light
heater cables in 67 different
67 bucket seat reinforcements different 68 69
There is more sheet metal on the body that is different have think some more.