Track broadening

Moin moin Once again I have pulled up my summer tires (Ford Titanium Alu ́s, see profile). But since they have an ET of 52.5, they are now quite far inside. I want to get distance disks for it to look harmonious. The tire hinsel said, I should take a water-wag and hold the at the upper edge fenders and then measure (tire hub to the water-wag) then I have about the size I can take. Gasaget did. The result is about 55mm per page,if I now get 50mm slices, do I have to pay attention to what? 50mm slices is already a lot. Or should I rather measure inside fenders/wheel?