I have googled a bit, and on one of many forums I might have found a link to a font that is close enough to the original logo, plus fulfills an important requirement that the letters and numbers be wide enough for optimal adhesion of the magnets to the car.
Behold the original Honda S2000 logo.
Now behold a free font "Sofachrome" which is available on 1001 Fonts.
This is how the class and number will look in this font. I think I could live with that.