Just going off FH1 and FM4 - and pretending all road cars from FM5 make the cut:
1970 Alfa Romeo Montreal
1960 Aston Martin DB4 Zagato
2004 Aston Martin Vanquish S
Austin-Healey 3000 Mk. III
1931 Bentley 8-Litre (you've got the power to do this, T10)
1971 BMW 3.0 CSL
1986 BMW M635CSi
1995 BMW 850CSi
1995 BMW M5
1954 Jaguar XK120 SE
2011 Mazda 2 (Seriously, one of my winningest cars in FM4 - oh wait, there's a new one coming this year...)
1972 Mercedes-Benz 300 SEL 6.3
2010 Morgan Aero Supersports (Or hey, throw in an old Plus 4... or even the 3-Wheeler)
1978 Saab 99 Turbo
1967 Karmann Ghia
...
There, less than 20 additions, that - other than the personal favourite Mazda - definitely have a nice Euro flavour.