I have a 2007 Mustang Pony Convertible that has been converted to a GT i.e. it has the GT rear bumper and dual exhaust. I just want to confirm that your trailer hitch product # 60809 will fit this vehicle without any conversions?

We are unable to confirm fitment on aftermarket conversion packages. Click on the install sheet, and view the hitch dimensions below so you can determine if there will be clearance:
Hidden Hitch 60809 Instructions

 as received from Cequent Towing Products