When I think of "rail-type" rockers I think of shaft mount rockers. No where in those links I supplied does it say "rail-type," and they are the part number you said you have. They specify them as being roller tip, like I said.
I don't know about your E7 heads, but mine sure didn't have guide plates, and they definitely didn't have hardened pushrods - both of which are required with stud mount rocker arms. Stud mount rockers do not require guide plates.
I was under the impression that converting to stud mount rockers required machining, but I have never done this, so I can't speak from experience.
'94 Laser red 'vert. Still a 5-oh... for now