Sandersons DD7's

I've got those on my 72 dart, AC is removed but I'm sure it wouldn't matter. Before I ordered they said they would fit without modification but when i installed them they were just laying against the rag joint. had to shim the motor & install a flaming river steering coupler to make them fit. When I told Sanderson my problem they said they only fit a 73 Duster but they can fit the dart with some "small' modifications. $500 for headers, $200 for coupler and shims, could've got TTI's for that price. There good headers but are not a perfect fit.