Would most of the interior parts from an 85 dodge conquest be interchangable with my 88 starion?

For those who are not on coil overs does adding mookeeh front and rear CC plates affect ride height? On some cars they come with spacers to shim up is this the case with these? I could go down in the front a 1/4 and up about a 1/4” in the rear to get the stance I would like. 

https://bringatrailer.com/listing/1987-chrysler-conquest-tsi-19/  

I have not split my bumpers yet to see what kind of rust issues I have on the supports. What can be done to prevent this issue from happening again? I'm sure you can coat the foam in possibly a bed liner like product, It might melt it if applied thick. And in searching I did see mention of drilling drain holes and removing some foam around the fog light area. So anyone have proven solutions to this issue?