Hey HANCHO1990,
It looks like the rear windshield is bonded in these cars. It will be stuck on using a urethane adhesive.
There is a potential you could source the part from a breakers yard but they would need to have a windshield removal tool to be able to remove the glass without breaking it.
It is not generally good practice to reuse bonded glass once it has been removed. You may not be able to find anyone who will then fit that used rear glass for you if you do not want to do it yourself.
Unfortunately, I cannot find another resource for a rear glass for your Mustang.
Best of luck with the search.
Regards, Joe
Monday, February 10th, 2020 AT 12:16 AM