The car - which Sir Jimmy called "The Beast" and still has his personalised JS 247 plate - is expected to be the highest priced single item at the sale in Leeds.
It was bought by an internet buyer as hundreds of people packed Savile Hall in the Royal Armouries complex.
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Lizzie Jones is spearheading a new campaign to raise funds for defibrillators for community rugby league clubs across the country.
Eddie Hall, 41, had been working as a chef in Ho Chi Minh City for over a year but was reported missing in January.
Cold with wintry showers for North and West Yorkshire and across the Pennines. Ice and snow warnings issued