i need to order the seals for the side glass ,dart swinger 2 door hard top, the window felts or cat whiskers. and they list different part numbers for a 69 and 70? so i am not sure what to get, the car was a 73 but i changed all the interior to the earlier style like the 69 or 70 had and also changed the doors to the ones with the wing glass. not sure what year the doors really are.
they also list the wing glass seal for a 67 - 69 , but i thought they would be the same to 72?
so how can i make sure i get seals that will work?

Order both sets and return the one's that don't fit! For the life of me I can't think of what would have changed. I have used 72 doors on a 68 just recently and everything fit fine. Of course the door lock pulls are in a different place, but they bolted on fine. The only thing I can think of is that there is an added "bulge" on the inside of the 70-up doors that is near the wing window where the whiskers fit, so that must be the difference. It is hard to explain but I don't remember seeing it on the 68 doors.

I am not sure what year my doors are , is there a way to tell?

67's have a unique wing window latch and lock knob at the end of the door.
68's have the common 68-72 wing window latch and lock knob at the end of the door.
69-72 have the lock knob moved forward about 8" as I recall, but physically they look the same. If they have original paint the 70-72 will have a mylar tag on the drivers door with the VIN and date of manufacture.
There are differences in how the handle attaches to the rods on the inside from 67-69 and 70-up. The only other thing I have found is what I mentioned earlier about the area close to the wing window on later doors.