No integra rear seats will fit perfectly.
This is from a 6th gen coupe, 5th gen should be similar.
You can see the gap in the front corner of the seat bottom.
These are 4 door type r seats from a JDM 4DR ITR.
The bottom portion drops in but needs some slight mods to work.
For the top portion, the owner removed the seat cloth from the ITR seat and wrapped it around the stock Civic rear seat.