He used to vintage race a Ginetta G4 at Zandvoort.
And as far as I know he was involved in a couple of NSU specials.
One for Wagenaar Hummelink ( that one was developed and changed for Slalom Racing and I believe it still runs but now as a monoposto with a watercooled VW engine ), and an other one that stayed on the track.
I think that one was found not too long ago, so I thought it might be it.
But its not....
Maybe I'll remember where I saw this one...