Door Weatherstrip on 86 Custom Deluxe

[11555wally]

I have quite a bit of air noise from the doors on my 86 Custom Deluxe. I ran across a post about weatherstripping that goes on the door. Mine does not have any on it, just on the cab. Was that not included in the cheaper models? Is it there to cut down on air noise? Is it obvious where it gets installed or does LMC or other suppliers give instructions. Any help would be appreciated. Thanks in advance