1966 Chevy 3/4 ton pickup

[Duncanp]

Hello, I recently purchased a 1966 Chevy 3/4 ton truck.
The rear wheels are 16.5” with the hubcap tabs on the inside. The front wheels are 16” with the nubs on the outside. I assume they are not the original wheels. The shop manual doesn’t note 16.5” wheels. Can somebody please clue me in on what the original wheels for this truck should be and what size hubcaps I should be looking for?
Thank you.
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