The Sportlines are 8” diameter, the same as the amarok cantaras I replaced mine with. Didn’t have spacers on the sportlines, but have put 15mm spacers on the rears with the cantara’s which brings them out sweetly within the rear arch. Have left the fronts without spacers because personally I don’t think they need them.
I think the sportlines with a 15mm spacers on the rear, and nowt in the front would have looked equally good.