NOS part but we don't know what its for? Have part #

We have a one NOS molding here with part # 3579362 I don't know what it is for and can't find it in our parts book. Any help would be appreciated because it is going to the swap at Mopar's in the park.

RF WHL OPENING MLDG (SA 3504734) B CHGR 71-72 71 72

Thanks