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.
Miata door window replacement.
Any of these problems the same door and window disassembly is required.
Later models may require a different method.
I did find ads for replacement back panels with a new plastic or glass window but those were also relatively expensive.
It may not be necessary to remove the door panel to do an adequate job.
The original parts get cracked rusty and unsightly so replace the belt line molding on your miata for a refreshed factory look.
Mazda sells a replacement back window for 370 and that is just for the clear plastic part you then need to take it to a shop to have it installed.
Lubricating miata door windows lubricating the door window channels can make the windows roll up and down more easily and can prevent future problems with the mechanism or cable.
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.
This repair may be undertaken by any careful moderately experienced diy mechanic although it involves trim that requires care to replace neatly.
Use white lithium grease.
A catalog sells replacement plastic back panels for 170 and glass back panels.
This repair is performed on a 1992 miatain the photographs and example below.