I need to get those, myself.
As far as I know, the front door outer window wipes are the same for all F/M-body 4-door cars (’76-89). The rear doors should also be the same length – but I suspect the Fifth Ave cars might be different because the back half of door glass is covered by the door cap extension.
I can’t comment if 2-door glass wipes (inner or outer) will work if cut to length, or not.
To remove the wipes, you need the door glass down (or all the way out). You will see several screws going through the wipe to the outer door frame. This is a good time for a magnetic screwdriver for those small screws can/will run and hide from you.
I wasn’t sure what car you have so I looked up a ’77 F (most popular F-body) and an ’84 M.
’77 Front door outer wipes (Chrysler calls them weatherstrip, window belt front door, outer) part number is 3875396-7 and rear is 3875422-3.
’84 Front door wipes 4310712-3 and 3875422-3 for rears (which is the same # as the ‘77’s).
I would bet a nickel the fronts would interchange between the two years – but not done a side by side comparison to know for sure.
The older Mopar outer wipes look the same but have several small fingers that clip into the door frame whereas these screw in. If you get some aftermarket, post details (and pictures) and what you did to get ‘em to fit for I will be doing this sooner than later, myself.
BudW