Don't use belt dressings, those products only decrease the life of the belt.
For the kouki front, you don't necessarily need the big metal crash protection bumper (the thing most people call the bumper support) from the kouki, those are the same for 95-98. BUT there is a thin bracket that runs the width of the bumper that mounts on top of it, containing the mounting holes for the bumper cover (which most people call the bumper) This piece is different between zenkis and koukis. I just got the whole bumper and bracket assembly for my swap just to save trouble. This is one detail most of the geniuses on here will forget to mention, probably because most of them have never done the swap before. Some people who run big intercoolers don't even use any of this, I guess they just let the bumper cover hang by the fender mountings or something, so I guess you don't technically "need" it. But if you value your life and the cost of all those parts in your engine bay its a good thing to have.
Another thing I forgot to mention: the headlight mountings between zenki and kouki are different as well, you have to drill new inner holes for the kouki headlights, another little detail all the internet experts never seem to mention.