The green one appears to be a Rupp D-301 with extra steel welded on the front axle and on the engine mount. The front wheels are the original Rupp "Turbine" wheels. Not sure about the gray one. In its present state, it'll probably bring just a fraction of what they're asking for this one: RARE EARLY 60’s RUPP D301 VINTAGE GO KART! Original owner
They're both adult sized--they weren't made to be comfortable to sit on. The riding posture was "knees in your face".
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