I’m considering spacers so I measured the wheel depth relative to the fender. Thought maybe some others might want this info.
The measurement is from a vertical line touching the fender edge to the sidewall of the tire at the 12 o’clock position. 25mm for the rear and 15mm for the front The ground is not perfectly level so these measurements are close but not exact.
Looks like most of the additional rear gap is due to the increased camber in the rear. The depth from the vertical edge to the tire sidewall at the 6 o’clock position are almost the same front and rear. When measured at 6 o’clock both the front and rear tires are basically directly under the fender edge.