At the 1969 Tokyo Motor Show, Isuzu presented a concept car called Isuzu Bellett MX1600, designed by Tom Tjaarda. It was a mid-engined, rear-wheel drive 2-seater super sports car. Apart from sharing the 1.6 L engine with the GT-R, the MX1600 had little to do with any production Bellett, and it never materialized into a production vehicle, but it is said to have inspired the De Tomaso Pantera by the same stylist.
Source: wiki