1989-1990 front brake differences
 

I have a 1990 xj with 1989 brake components. My question is will rotors intended for a 1990 cherokee fit on a 1989 cherokee. I know the pads are different but what about rotors?

Pads and rotors should be the same. RockAuto.com shows the same part numbers for both years.

the only difference that i can remember from my 89 to 90 was the brake caliper was on a bracket on the 89, if i recall. but everything else was the same.
i swapped in my 89 axle on my 90 to get rid of the vac disconnect. i had to swap the 90 c knuckles onto the 89 axle so i could use my 90 brake setup.