I "googled" images for the Opel Manta and Mercury Capri and found the following. They do look similar, but the shape of the back window is different.
Mercury Capri
Capri.jpg
Opel Manta
Opel Manta.jpg
While I was looking at Opel pictures I saw this nice looking 1964 Opel Rekord. The front grill at least appears very similar to a 1963 Falcon's. The vertical fins on the front fenders are nice. The 1961 Plymouth Valiant had horizontal front fender fins. Those would have opened another car up like a can opener in a collision.
1964 Opel Rekord
Opel Rekord A.jpg
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