Bonsoir , j'aimerais savoir si il existe une pièce ou un système D pour joindre les 2 parties de la lunette arrière ?

Bonjour

Apparemment c'est un joint en silicone qui sépare les deux vitres alors un tube de silicone liquide et du ruban adhésif de peintre devrait faire l'affaire. Sinon n'importe quel professionnel pourra te faire ça pour pas très cher. 

Rear window glass is two-piece with a silicone seam between them that allows it to fold.

http://www.mustangsunlimited.com/itemdy00.asp?T1=GL156BLU+01

sinon en regardant de plus pret , la fermeture eclaire qui est assemble la capote et la lunette arriere n'est plus collée ou cousu , y a t il un colle speciale ou faut il la recoudre ? merci pour tout vos conseils

Pas le reportage photos mais en ce qui me concerne je n'ai que la lunette arrière à change , mais cela donne une bonne idée , merci 

voilà j'ai fait tout pareil avec du silicone COLLE transparent (prevoir deux tubes et 3 jours de séchage au soleil)

After cutting it out use masking tapeon the outside of the glass, leaving about 1/4" of glass showing inside the tape edge. mask the top and bottom of the seam. go inside the car and put some clear package tape across the joint from one side of the car to the other. This will actually hold the glass in place, then go back outside and using clear silicone and a caulking gun fill the seam with silicone. while it is wet use a rubber squegee or your finger laid flat across the seam and wipe the silicone smooth. once the silicone starts to tack up pull the tape from the outside of the glass. leave the inside until it is dry. once the silicone is cured, about 24-48 hours you can remove the tape from inside and start lowering the top again. I have done mine twice in the four years that I have had the car, but the top has been up and down well over 1,000 times. the silicone holds for about two years before it starts splitting and you have to do it again. This is a cheaper way of fixing the window because if you take it to a top shop they will replace the window and that costs money. The silicone is only about $4.00