Roof rail weather strip seal

Rear quarter glass rolls up into the slot, door glass closes against the outside of the seal. Otherwise you'd need auto drop glass like a new challenger to open the doors.
Thank you to the members who responded. I now have a direction to go in as l am winding down the restoration of my car. BTW. The early a bodies as in 63/64/65 and 66 Darts have nice body lines unique only to those years. My GT is a restomod. Not stock. That includes Reilly Motor Sports triangulated 4 link rear end with Eaton 355 posi center section and rack and pinion IFS. Wilwood 12” drilled and slotted rotors with 4 piston calipers. Coil over shocks and subframe connectors. Schott Velocity wheels 18”x 9” rear and 18”x 7” front with Michelin tires. Also slightly enhanced Chrysler 360 built by Bob Mazzolini racing in Riverside Ca. The paint is two stage gloss black with a creme color leather interior. Painless 21 circuit harness and has Vintage air conditioning. I blanked off the dash and cut in a 6 Auto Meter guage cluster. Also hand made center console. I’ll post some photos. Thanks again. Mayflwr