standard gti's where 205, but then later ones came out with 195 tyres 
myself and most people use toyo T1R's 195/50/15
Wrong way round...
Early GTIs were 195s, later 205s.
Annis 216/40/16...
and a 205 wide tyre is perfect for a 6.5" rim.
I didn't even know that size existed, or is that a typo and supposed to be 215?