Stock 177s, for E53, show front offset of 45 , and rear offset of 30...I assume your
replicas have the same as oe.
Here is a link to one of many wheel offset calcs found on web:
Wheel Offset Calculator
That calculator looks like 28 mm worth of diff...
Other than looks/cosmetics, I don't see the need to add spacers,
esp. for rolling around in the winter, but you may feel the look is important.
Hope this helps.
GL,mD