Depends on year model. For several years Chrysler used a adhesive backed grey weather strip like foam 1/8 x 1 ( those shops that put aluminum caps on pickup beds would call it "cap tape" ).
At a later year Chrysler started using a extruded caulk. I don't know which is less likely to trap and hold water. Nothing at all might generate a wind noise/whistle.
My 67 had the foam tape so that's what I'll put back.
