Thanks Jocko. Your input is spot on. My truck is not a Special Promotion truck, it does not have the YG6, 7, or 8 package.
It is a Z62 CUSTOM DELUXE EQUIP and came with the 611 BLUE PLAID BNCH TRIM. It does not have the PO3 chrome hub caps listed. All of this is according to the SPID. So the white hub caps are correct. That is good to know. Now I just have to find a fourth one and freshen them up, along with the wheels, to look better.
Or if I come across a decent set of chrome hub caps I guess I could go that route. It just would not be correct for this truck. All hub caps for 16.5" wheels are probably hard to find. But the chase is part of the fun!
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1972 C20 402/TH400/3.54 Highlander
1969 Camaro RS with SS trim, 1967 Camaro RS/SS (sold)

1983 GMC Sierra Classic 2500 crew cab (sold)
1972 Chevy C10 Cheyenne Super (sold)
1984 Chevy Silverado C20 crew cab (bought new by my uncle, in the family until I sold it)