Originally Posted by 65fastback6
NPD lists two different ones:
43720-1A "U shaped profile"
43720-2A "trapezoidal profile"
Which one is correct?
Which one is made by Daniel Carpenter?
From the other post seems that the DC is the way to go.
To be honest, I don't have an authoritative "this goes here, that goes there" answer on u-shaped vs. trapezoidal for fastbacks. My Ford Project Manager could probably construct a helpful answer and guide, but he'll not be in until Monday. Our system basically says that "most" 65-66 fastbacks were fitted with the 43720-1A U-shaped, and that "some" 65-66 fastbacks and "all" 67-68 fastbacks used the trapezoidal 43720-2A.
Either should function/install well.
Both are Daniel Carpenter.
Were I making a barely-educated guess, I'd say that the trapezoidal w/s snuck onto some late-production 1966 fastbacks at certain plants, as a general whiff at a guideline.