That tank is straight fro an 1980 TT500, as well as the seat. I remember riding the white XT500 version on the dunes in Southern Africa. Look at the thin frame tubes and the skinny front forks. These comments are about Jo's pic at the top.

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2010 XT660Z Blue, Exan can, UFO high front fender, SW Motech baseplate, heated grips, 12v point, Kevs Fuel & O2 mod, DNA Stage 2 Filter and cover, Givi tall screen, Mefo mfe 99s, Kevs throttle mod, TT high seat and 'compass'