Analysis of information sources in references of the Wikipedia article "Triple Crown of Motorsport" in English language version.
As well as the customer teams, Lanzante Motorsport was tasked with running a 'works' car
From a racing team standpoint, McLaren is the only one to have accomplished the triple crown.
McLaren set itself up to support the customers at Le Mans but the programme took an unlikely twist when a Japanese clinic, Ueno, wanted to back a car at Le Mans and none of the teams were able or willing to take it as their title sponsor. There was, says McLaren, no other option but to run its own car. This was a controversial move; for McLaren to compete against its own customers was not agreed and the customers were furious.
McLaren managed to clinch the Triple Crown of Motorsport as a team.