Found on Club Civic. Figured You guys might want it... possibly Sticky?
"I, as well as many other civic owners have posted a thread trying to figure out what seats from other cars will swap into an EK. If anyone would like to help me start this ever-so informative thread on what seats will bolt right in to a 6th gen civic (or fit with minor modifications). If you have done a seat swap from another honda, acura, etc, and know it fits, how hard it was to put in, and what the seating position is like compared to stock, then post a reply.
96-00 Civic seats - (seat rails are the same...)
Bolt In Fit (may require swapping one or both rail(s))
Del sol seats - (del sol seats will fit. you just need to change both rails from each seat. crx seats needed to be welded, as so s2k seats, and o3 si seats. )
94-01 Integra seats - (swapping both 94-01 integra rails with stock 96-00 civic rails = perfect fitment. )
92-95 Civic seats - (the 5thgen seats will fit by switching the outter rails)
01-05 Civic seats
Fit By Welding
91-96 Prelude seats
97-01 Prelude seats
02+ RSX seats
Fit By Swapping seat pan & rails
S2000 seats - (you have to swap the entire seat pan. That means you get the S2000 seats, and then skin them and put the Civic seat pan and rails onto the S2000 seat. This will make it so the seats recline like Civic seats do (S2000 seats barely leans forward since they're from a two-seater roadster) and they'll then bolt into the Civic perfectly. )"
DIY - 92-96 Prelude Seat Install In EK