Although this car does feature on several sites described as a Z3, I think they are all compounding the original error..
There appear to have been just 6 Zatos built, 5 of them the L3 with a 90 bhp Audi engine then this one single car with a 140 bhp engine, which is named the L3S.
I've amended the title but not merged the puzzle with the original L3 puzzle, as this is strictly speaking a different model with only the one built!