Later models may require a different method.
Miata door window replacement.
This repair is performed on a 1992 miatain the photographs and example below.
On the lower exterior is a single weatherstrippingwhich keeps water out of the door protecting interior components of the door from wind and weather and creating an aesthetic appearance at the lower edge of the window.
Use white lithium grease.
Situated on top of the door these trim pieces act as a seal between your window and door keeping debris out but letting water drain through normally.
It may not be necessary to remove the door panel to do an adequate job.
The inner panel shown is for a miata with manual windows.
Note that not all miata s will have the same door panel some earlier models may not have the.
The original parts get cracked rusty and unsightly so replace the belt line molding on your miata for a refreshed factory look.
This is a typical miata door assembly.
I did find ads for replacement back panels with a new plastic or glass window but those were also relatively expensive.
This repair may be undertaken by any careful moderately experienced diy mechanic although it involves trim that requires care to replace neatly.
Any of these problems the same door and window disassembly is required.