Sorry,
but unfortunately I can't leave it like that. Of course I have to accept, that it seems you didn't know enough about the car at the time of listing.
Despite assuming that this as an accurate Racer 500 DB (ignoring the front axle), one cannot, on one's own assumptions, decide that the car will be named as an accurate Racer 500 DB, while Hiawatha and me where at the right way to identify this car really!
Please have a look at my answer from June 18, 2022, 06:31:16 PM: DB Monomille 850cc, Joël Leblanc, ex Christian Farin
Everything has been answered correctly, only not Monomille. And 850cc is also right and wrongly answered by yourself.
Sorry, but if everyone may call any puzzle car as she/he wants, it will get clearly impossible, to get correct solutions.
Two proofs attached
I hope that these are convincing, and that not one's own imagination, but the truth comes into its own