Windshield differences

Hello,

can anybody tell me SURE were are the Differences between the Windshields for a 1970 and 1971 Dart?
I have a 1971 Dart Custom 4-Door from Switzerland and a Body from a 1970 Dart Swinger from Canada..
I want to mount the Windshield from the ´71 into my ´70 but it doesn´t Fit!
The ´71 Shield is about 3 cm to smal and about 2 cm to high...

Now i want to know which Shield fits for my ´70 Swinger??
Is it because it is 2-door and 4-door, or is it because it is 70 Swinger and 71 Custom??

I found a Site were i can Buy but it´s not so easy...don´t want to buy a Shield and then it doesn´t fit...

take a Look:
https://www.bserved.com/psautoglass/store/Scripts/prodView.asp?idproduct=18

Thanks for any Help!!

P.S.: maybe my English is not so good, so please be forbearing.. :sad1:

Greetz Tom