The trim piece around my plastic rear window has cracked and is falling off in pieces. The purpose of this piece apparently is to trim out and possibly seal the canvas top to the canvas skirt around the window although it doesn't seem to be "glued" in place. Of course the sun may have had something to do with that. So I bought a replacement window from Miata.com and found that this piece was not part of the window replacement so I am sending it back since my window is in perfect condition except for this "trim piece" It is round in cross section with a slit in on the inside and is one piece that fits around the entire circumference of the top opening. Does anyone know where I can buy this piece???