This is a long shot, but as van Gaal would say it "you never know how a cow catches a hare".
For four years, Hockenheim had a 12-hour race for small cars up to 700 cc. Now I do know the winners of the 1960 and 1961 editions (in fact they are on my site), I found some good results for 1959 but for 1958 Google turned up a lot of interesting things (like an artikel in "Der Spiegel") with many details concerning the cars and the top-5. It reveals fascinating facts like the average speed of the winner being 110,7 kmh (including pit stops) whereas the winning car (a Lloyd Alexander) would have a claimed top speed of only 100 kmh. So even on this level, works preparation and tricks were already a part of racing.
Despite the top-5, I haven't found any name of the drivers in the top-5, not even the winners.
I only know that Hans Stuck Sr was entered in a BMW 600, but from that car I don't know the result.
Has anyone information on the drivers' names?