 Complete the following phrase:  The McLaren M7B, an experimental version of the car with unique low-slung pannier fuel tanks, was then obtained along with a Cosworth DFV engine to replace the rather slow Cooper, which was sold to Swiss car collector Walter Grell. Elford drove the McLaren in a further four Grand Prix that year, finishing tenth at Zandvoort and finishing the next two races in the points with fifth at Clermont Ferrand and sixth at Silverstone. The 