1970 Duster brakes

This article is about swapping drums for disc...I already have disc on the front. What I'm looking for is info on if swapping to 5x4.5 is as simple as replacing the rotors and bearings or if more is involved.
IIRC it is possible to do a simple swap out. This might help Wilwood Disc Brakes - Search Wilwood Brake Kits both of these kits are 5x4 or 5x4.5 (dual bolt pattern hubs)