I couldn't tell by the ones that I took off or by the write up from riff raff.
I put the two ribs down to the cup, like the one on the left in the picture.
When I did my injectors, to be perfectly honest with you, I didn't even pay attention. Unless I got lucky and installed all eight correctly, my guess is that it doesn't really matter. There may be a "preferred" way to do it, but I bet wither way will work.
Can you reuse the copper washers if you're redoing the o rings?
This happened, the way it goes I guess.