Ok, i have personaly done this swap and currently have the seats in my car.
S2000 Seat pans would not bolt into my 97 integra. So its fair to say They wont fit in any 94-01 integras, and 92-95 civics. I also know that Da integra seats mounted perfect into a 90 Ef and an EG im 99.9% sure on this, so that would mean DA, DC, EG, and 90-91 EF, all have the same seat/bolt pattern.
Now, to fit the S2k seats in my integra i removed the seat pan from my DC seats and used the butt pad and backing from the S2k seats. All you have to do is flip the seat over, remove hog rings from seat pan/ butt pad, then remove padding itself. From here you will roll up the padding on the side ofr the pack pad and there will be two or three bolts on each side that connect the back pad to the reclining device connect to the seat pan. Once you have doen this you should be left with an empty seat pan. Do the same to the S2k seat or witch ever, bolt the S2k back pad to your cars seat pan, slapp the butt pad down and recrimp hog rings. You should now have a perfect fit fully reclining S2k seat.
Now for accord and preluce seats, this may not work, The s2k and integra are really about the same size, preludes and accords are bluky, so the seats are most offten wider, though older prelude seats dont seem to be. This method very well could work for accord seats on to integra or EG etc. etc. But for the most part we can figure that swap will work with DA pans, DC pans, EF pans, and eg pans. Though it also may not, being that all the pans bolt patterns seem to be the same you may need to use integra seat pan for you EF if you want the S2k seats if there was some unforseen problem with the S2k bolting to the EF, EG, and DA pans. But i do know the bolt patterns are the same and the padd swaps on to my DC pans was a direct fir for the most part. I did have to remove some wireing that whent across the pan so the butt padding of the s2k seat would sitt propper. The integra seats road on the S shaped wire like a shock system for your but where ass the S2k padding had all padding and needed to sit farther down in the pan.
I am also 99.9% sure this padding swap can be preformed with the RSX seats.
What i would say to every one is think through what i posted and try different things, we will never know what works till some one takes a chance and trys. And theres plenty of info i think to try other seat swaps/pad swaps. Maybe even just grab a yard stick and measure from metal recline bracket to metal recline bracket, if theres not any big variable between the points on any two model seats, i would have to imagine theres a good chances they will swap over and work out great on your stock seat pans.
For accord into civic/integra or vice versa yuo may NEED to just get the brackets welded or somthing, but for me this was not an option, i would have opted for leather integra seats over the S2k seats if not for this method, theresa few things i dont like choped hacked and rewelded, my seats, my streering wheel, and my seat belt.
PS. i know its long but i hope it helps.
