Not trying to argue, but I’m wondering why they wouldn’t fit a Dart?
Dart wheelbase is 3” longer, wouldn’t think that would affect anything?
I have the TTI 1 7/8” - 3 1/2” and when following the instructions, the went in very easy and fit great.
Basically when I spoke with TA they told me they would build me a set but if they didn't fit, they wouldn't issue a return. Building any type of Mopar is costly enough to start taking chances on $900.00 headers that may or may not fit.