Boudewijn, I'm doing my best, considering I'm stuck at work and have no reference materials. #3 is Arena/Nicodemi in the 1967 Targa Florio (030).
#2 - Jean Guichet's Filipinetti Dino 206 (0842?) destroyed in practice for the 1967 Nurburgring 1000km.
Almost forgot photo #4. Also taken at the Nurburgring (as so many of these photos were), but this time in 1961. The car in front is 0790 which was driven by Ginther/Gendebien and the car in the background is 0796, which was driven by Hill/von Trips.
And passing in the background is the Lotus-Ford of Pierre de Siebenthal and Francisco de Heredia (s/n?).
Just curious, what was the cause of the fire in the #2 Dino photo? Not good to have your car go up in flames in a practice lap. Was it the result of a collision, fuel leak, etc???
Automobile Year says it was a carburetor fire. Other reports say that driver and corner marshals tried to put it out with extinguishers, no success, and that it took 35 minutes (!) for the fire truck to arrive.