also to answer some questions from your first post
only the 1985,86 and very early 87 had "uncovered" tail lights, the rest had series3 oz style lights. The difference is not just the smoked plastic cover, the lenses and reflectors are quite different to each other. Similarly, not all import r31s had projector headlights, the 85 series2 style obviously did not, and the 1986 cars also missed out, having standard headlights, like those on australian s3 r31s.
gtr69 - as far as i know all imports had r200
just for your own interest racsov500.... my own car is a 1986 gts coupe, with updated projector headlights and original gts uncovered tail lights (black as opposed to passage grey). It also has the updated front grille, with GTS monogrammed into the left hand side. The 1986 versions had a central GTS badge. These cars came with the NICS rb20det, which i binned for a r32 rb20det silvertop.
i hope u succeed in owning your own r31 in the next few years