Carnut has positively identified Rust 17 as an Eurocco. The remaining Rest is in fact Rest 24 ( ), which is a modified VW Scirocco. Its name is not Eurocco, and it's not by Treser. Find it and the point will be yours. Locked for one try.
Sorry, not sure why I put Rest 17; I'm in Finland on business and was in a bit of a hurry when I wrote it!
Fortunately it's a night off for me so I've been able to waste 2 hours Googling for this damn Scirocco Mk2, but at least I got a hit when I found a Wambach Rocco, the guilty party living in Wendax's home town of Hamburg!
Googling for more pictures finds the puzzle picture, which seems to be called the Wambach Rocco Sport Targa, but I'm not sure whether it was a slightly different model or one that some enterprising individual has ruined further with modified wheel-arches etc.
The 'factory' Wambach version is pictured below.