will a 91 integra LS steering wheel fit on a 89 CRX Si?

 

Yes but it is a little bigger, and it doesn't stick out as far. The wheel will be real close to the wiper, light controls, and you will have to do something, about the horn/cruise controls. Other than those issues it will work.

 

I just did the same thing in my 88 crx i just used 2 washers otherwise you cant turn the wheel without hiting the turn signal with your fingers.