Side louvers were a factory option on Daytonas. #4636689 1987-91 metal,black. Dealer cost 155.00 (1-1991 issue of Mopar accessory parts.
Rear louvers came in 3 different part numbers depending on whether the cars had rear wings (Turbo Z pkg makes a difference). A note in this accessory book clearly states: "rear wiper must be removed on vehicles so equipped with the rear louver".
Also it states that in cold climates the struts on the liftgate should be heavy duty due to the extra weight. #4378249 for the pair for G bodies.
P Body rear louver is #4443218 2,4 Dr.
L Body rear louver is #4443271 (4 DR/rear wiper)
L Body Charger/Turismo 2 DR rear louver is #4206349
Above part numbers are the Mopar #s from this accessory book.
I have most of the accessory books back to 1970. These part numbers are not usually found in the regular part books.
Anyone needing more info on these or other accessories can write me here: mkolner14@hotmail.com