None of them do that.
You need to understand the GM part numbering systems to see whats going on. The part numbers in the Assembly manuals are engineering part numbers, and these may represent a single component, or an assembly of components. The center link assembly in UPC 4 (I think) is a good example. It is a single part number for an assembly of the center link, inner and outer tie rod ends, the tie rod, and the idler arm. These numbers are not the same as used in all the Service part catalogs. When a new component or vehicle is added to the GM "system" The Parts department decides if they are going to carry that exact part, or if an existing part number will "serve the purpose". If they need to carry a new part a service part number is assigned and that part get added to the parts manual. Initially GM added alot of new parts to the parts catalogs when new vehicles were introduced into the system, but over time these parts get reduced down by functionally similar parts and number change, get supperceded or just plain deleted.
Springs are another example of parts getting consolidated. In early 69 there were probably 20 different front springs you could get on a Camaro from the factory, plus those used on the earlier 67 and 68 cars. The parts catalog from Sept of 69 carried about half that many and consolidated many applications that were close into single part numbers. By 1972 there was only about 5 springs that were listed in the parts manuals.
Part numbers on service parts for the most part have no bearing on the part numbers the original engineered item may have cast or stamped into them. If you buy an "NOS" 69 trim ring for an SS based on a part number on a 1980 GM box, you may be buying a consolidated part that originally was made for a 1975 Nova. It will fit on the wheel, but the profile, or the shape of the valve stem hole probably won't be the same as what was on the car the day it rolled off the assembly line.
