Modified GT in Instanbul Turkey.jpg
This pic cropped up on a non-Opel Facebook group. An FBer with the handle "Cihturbo Manta", who is one of the most knowledgeable Opelers and Opel collectors, said: "I know this vehicle, its an OPEL GT in Istanbul, Turkey."
The door is the right shape for a GT, except for that upwards curve of the sill at the back and different door handles. It appears to have the pop up headlights. The windshield looks correct. The slope of the hood seems close enough. The car has clearly been widened at the back and probably has a different rear axle, hence the hole pattern difference on the wheels. The passenger compartment looks to be narrow like a GT. Clearly this car has been modified out the ying yang and probably has parts from other cars grafted onto it, plus a ton of body putty and custom panels. Granted, there's probably only about 50% or less of a GT still there.