5th gen honda seats bolt to the rails from the bottom, 6th gens on the other hand bolt from the side
the rails from the 5th gen can be modified to fit most bottom mounted seats while 6th gen rails can be modified to fit most aftermarket side mounted seats
best bet is to buy the rails that are made for the seats, but many companies will not sell JUST the sliders or brackets but rather you can only buy them if you buy them with the corresponding seats.
i ran into this problem with my current pair of sparco speed seats sitting at home
my gf has a 5th gen civic and the sparco seats mount from the bottom, it's easy to switch them over, but we made the mistake of getting rid of her stock seats in exchange for some 00 civic si seats a year or so ago....
i've had some people offer to fabricate me some rails and sliders... i think i might actually take one of them (the only one i really trust) up on his offer.
he is a one man operation that owns, builds, and sells tentrax trailors and he's an amazing fabricator
www.tentrax.com