yeh meant something like a 45, Ive got some mercedes 8 holes which are 16's and want to know how they will look once on, like size wise
If you are set on having a 45 ratio tyre fitted onto a 16" wheel you would need to go with something wildly big like a 245 or 255/45/R16 to maintain the rolling radius of the original wheel (shown below), and to keep your speedometer anywhere near showing the right speed.
I get the impression you won't want to fit incredibly wide tyres (not sure if 255 width tyres would fit a Mk5). As daft as my suggestion sounds, running a 45 ratio tyre on a 16" wheel is equally not clever.
These are all similar:
205/55/16
225/45/17
225/40/18
As said a low pro 16" would be massively out.