I'm thinking the Euro bikes went to a dual disk front brake system, thus the need for three lines (one from the master cylinder to the junction block, and one to each of the two calipers.) The front brake line is the same assuming a single cable/caliper, thus the '87 would be correct.
This is all pure conjecture on my part, as I planned on actually driving or riding up there to see in person. I'm sure a phone call will clear up your questions though.
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