Congrats on the 88 CRX. I'm not as familiar with the CRX as opposed to the EF Civics. If it's the same though 88-89 ae same & 90-91 are same. I do know that the 91 CRX Si came w/ rear disk. The front corner lights are different also from 88-89 the that of the 90-91.
Actual CRX owners should be able to help more.