Is 67 Dart windscreen trim different to 68 and later

You're quite right, the '68 up trim was different. The '67 trim was the plastic strip with the 4 corners and that particular setup was a one year only thing. When new it looked OK and didn't leak but after about 6 months the plastic shrunk enough to allow water leaks around the windshield. The dealerships had a major headache trying to fix the leaks and did their best to deal with it. Dad bought a new '67 Valiant and after a few trips to the dealer for repairs, he fixed the problem by drilling a series of 1/4" holes in the floor to let the water drain out. The dealership fixed the problem in early '68 by replacing the windshield gasket and trim with '68 parts. I would suggest you do the same...