A great amount of work was carried out to upgrade this beautiful W111 cabriolet to include the technology from the 6.9L W116. The work not only involve a simple engine and transmission conversion but included, for example, taking the entire front end of the W116 and combining it with the body of the W111. The complete rear axle was taken from the W126 and modified to include a special limited-slip differential. The car was also fitted with Behr air conditioning, 4-way electric windows, tinted windscreen, a (rare) headlight cleaning system and cruise control. This extensive conversion of the entire car is unique the road-holding and power delivery are breath-taking.