NAME THAT PART
it is not a window/ door seal....at least not on a '72.
I opened up a set of front and rear windscreen gaskets...this is a rear, 1972.
Looks pretty close....that may be enough to focus your search at the sites mentioned above.
rear window gasket, 1972 DUSTER. Part # WCR BD4932
Precision Reproductions
Hope that helps ya!