86 and 87 750 lowers are interchangable, 86 and 87 mids are interchangeable but you have to drill a new mount where it bolts to the head and 86 87 top fairing are about 1/2 wider at the mirror mounts. if you used the right fairing mount 1100 with 1100 and 750 with 750 mount. Of course the 85 is the odd bod in the whole set up top fairing with 3 bolt holes where it mounts to the mids and the 85 lowers are originally fibre glass and slight variation on the length. Exhaust all have the right spacing but 1100 pipes on a 750... depending on model ive only tried on an 85 hang too low and need the fairing cut