Wheel Dimension and track width

Hi.

I am thinking of building my own suspesnion for the gt40 Chassis i have.
I am thinking of different spindels in front and back from production cars.

The track width in front and back are 1397mm i think. What would the coorect dimension mesasured on the outside of the wheel to have it correct to the body.

I have done a lot of searching regarding wheel size and ET. Do any have the correct ET for a 8-17 front and 10-17 rear wheel? The only i fint is backspacing or offset but no one i have found says if it is positiv or negative values.
What i have found from my own drawing the wheels have to have a ET of -30? that is very odd and would not generate a very good ride and massive bearing vear.
 
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