Dave:
The initial order of the steel billet cranks was 12, originally I was also told that they were sourced from Mahle Germany, but later told they were sourced from the UK, probably Cosworth. This is hearsay so the actual numbers could be higher, but since the W210 with the 6.4L M119 failed to hit 200+MPH I was told that this led to the M120 EV12 versions which met their goal of a 4 door capable of 200+ MPH
From those 12 crankshafts, (9) 6.4 engines were initially assembled. I believe you are correct that Talbir purchased one of the remaining three for his 6.4 M119 build, Brabus probably used one on the more recent W124 E65 build, and one is supposed to be on display somewhere. My records show the following for the engines:
1. 1997 W210 Black, my car
2. Silver SLK, Bill Gates car that went back to europe after being in the USA for a few years
3. Black SLK, Tom Cruise
4. Vmax W124 Silver
5. Russia W124 silver/red interior
6. Russia W124 silver/black interior
7. Dubai, Red baron E500 with the 6.4
8. W210 estate, green in Germany
9. Talbir, car unknown
10. Brabus E65, Brabus Classic Collection
11. Crank on display?
12. Unknown
If the above information is incorrect please advise and/or correct. This information is what I have gathered over the years.
Jeff