Mike (and anybody else interested), I have test fitted a 7" wide rim for the rear.
This is how it stands right now:

rear are 225x60 on 15x8" and front are 205x60 on 15x7"
I then swapped the front wheel and rear wheel to check the fittings of an 7" wide rim:

rear are 205x60 on 15x7" and front are 225x60 on 15x8"
I have to say that apart from being a 205 at the rear, there is plenty of space in the wheel housing.
With the 7", the wheel does not stick out like the 8" one.
You will also notice that the front is higher now with the 225 tire up front LOL

15x7"

15x8"
I think you know what I'll be ordering soon
