When I did it in my EG, I just used the Prelude rails. Three of the bolt holes lined up, and I drilled my own hole for the fourth mounting point. Worked like a charm. Gimme a few minutes and I'll see if I can find pics.
edit: Oh...99 Prelude...I had 93 (or maybe 94, I don't know) Prelude seats...not sure if they were different or not. I guess this is kinda a worthless post now...lol
sorry bout that