sup everyone, got an interior question

sup everyone i have an 89 civic si h/b with quite some mods. ANyway this week i decided to do an interior conversion. I done the 2 fronts already and i'm having difficulty with the back. My interior is from a 2000 Honda prelude. ANyone have any idea or tips on how to custom the rears in, there's also a gap on both sides so i was decing to get a piece of wood, sponge it up and ge tthe fabric match from my seats. Anyone have any idea for the rears. thanx

What a project, by interior conversion, do you mean just seats, or are you swapping the dash also?

Post some pics of what you done so far.

By the sounds of it i think he might be doing door pannels.
tell us exactly what your doing so we can offer better advice :)
Good luck man!