You'll want the EV1 injectors unless you grab the EV6 harness. The wiring plugs are apparently different. I'm confused about this too...I thought EV1 was the 4-hole disk-style "design III" injectors that we want. I'll post anything I find.
My results...
From what I found, the EV1 and EV6 cases are physically different. The EV6 seems to have a different plug, with a catch on the side instead of the back like the EV1 does. The confusion seems to stem from the plastic thin injectors versus the fat metal cases. I suspect that's what everyone is confused with. What I was referring to is the "Design I" single-hole injector vs. the "Design III" 4-hole disk-style injector. Some bikes have even more holes, BTW. I've heard of 12-hole showerheads in Hondas...eight injectors and four throttle bodies for their inline-4 CBR motor...yum...
Futhermore, they are all top-feed. The only side feed injectors I recall were phased out in the 80s. IMHO avoid anything before 1990 as impedance/injector dimensions/spray patterns were all over the map, literally.