yeah, have run the r31 calipers on the wagon too, cant remember exactly how close to the inner guard the calipers came, the handbrake holding bracket on the calipers comes very very close to the leaves though.

when i ran the r32 calipers on the sedan i had to cut a section out of the inner guard to clear the brake line out the back of the caliper

i would imagine the inner guards of a coupe would be very similar to a sedan or wagon