The reference is primairly for the front knuckle assembly. The neons are well known for the front hubs failing and the recomendation is to replace the bearings and hub after every 10 hours of time on track. When Waterford hills put together the spec neon rules they tried to beef up the reliability of the cars by making the shadow knuckles legal. Note that this change is NOT legal for SSC or IT so if you plan to race outside of SN you'll have to swap back.

Others on here probably know the details of the swap better and what modifications must be made to get the knuckles to fit.