I had a complete ZX-5 SVT interior, including rear seats, in my '05 ST. There are only two mounting bolt positions for the seat cushions, because the sedan seat cushion is not split. The seat backs are not a direct fit, because of the location of the latch. I replaced the SVT seat back frames with those from the ST. It required cutting a slit in the back of each SVT seat back cover (the grey, fuzzy portion that faces into the trunk) in order to get the standard ST latches to work. The ST frames do have holes for all three rear head rests.
I had to replace the SVT side air bags with those from the ST, because they are apparently model year specific. That is, they are only compatible with the SRS Control module from the same model year.