crx->civic

Im running a dohc civic but have acquired a crx vtec....

First: Interior.,,. full leather. will rear fit?
second: Bumpers.,,. straight forward to put on?
lastly: Engine.,,. wiring, how difficult to change?

I think I asked the same question about the seats around a month ago and the fron seat will fit with some alterations to the rails but i am not sure about the rears,