Yes, that's the Cushman X'tréme. In the ebay description it said:
THIS IS A ONE OF A KIND CUSTOM MADE CUSHMAN CONVERTIBLE. HAS A 18 HP OMC ENGINE MADE FROM A 1973 CUSHMAN GOLFSTER. FRAME HAS 8 IN. ADDED AND ALL SHEET METAL WAS HAND CRAFTED. MANUAL CONVERTABLE TOP WITH COVER. HAS HEADLIGHTS,TAILLIGHTS,TURN SIGNALS, SPEEDOMETER, HORN, EMERGENCY BRAKE, TRUNK, EVERYTHING IT NEEDS TO BE STREET LEGAL.WILL GO 50-55 MPH. THIS CUSHMAN WAS JUST FINISHED IN 2010 , THE 1973 IS JUST THE SERIAL # THAT WAS ON THE ORIGINAL GOLFSTER.