Don't hold me to this because it's more than a decade since I had my CRX. Can you use a 91 bumper??? Sure, it's the same chassis. But you do have to use the 90-91 bumper support for it to bolt right up. I think you can trim a piece off the back of a 91 bumper and make it fit an 88 support, but I'm not positive. And you'll need all the correct bumper lights/lenses obviously.