For correct fit (length) 84/85 are different from 86/87. Depending who is making the wires, you may just be getting a universal set. The universal sets are a bear. Depending what you are looking for, venders like Red Armstrong (Quad Air) and Kirbans have correct length sets for the 86/87 turbo regals. For performance related applications, Russ Merritt and RJC racing make some nice sets. Do a search for previous posts on this topic. I remember reading something about plug wire sets not that long ago.