The wheels should be 5 on 4.5" if it is a 1/2 ton. I prefer the newer style wheels myself.
Mine are 5.5" wide so they accept a 235 75R 15 tire pretty good.
These older factory wheels are still around and can be found .... without really searching I have found a few and am able to come up with 4 that look like a matched set .... what I mean is, the 2 on this side are Ford wheels and the 2 on the other side are Mopar wheels .... they look the same and use the same sized hubcap.
I have seen some wheels on Ebay and they want $80 each and they do not know how to measure and check what size hubcap they use .... A local guy1.5 hours away wants to part out a old 60's Dodge truck .... He decides to sell wheels at $75 ... cheaper then ebay ... expects me to jack up the truck and remove them, then pay for disposal of the tires plus my gas to drive 3 hours round trip .... cheaper to just buy from ebay and pay shipping.
Then I found a guy on FB that sold me 2 bare wheels for $20 each and delivered them to my house ... they are out there you just have to look.
Then Wheelsmith sells a brand new powder coated reproduction for maybe $110? ... reasonable.
Then Hubcap Mikes sells these caps, I just got them this morning and they are $30 each + shipping.
Happy with the quality, they are not really thin and flimsy they are stout.
For a daily driver, I think they are fine .... hubcaps can fall off, especially older ones with a loose clip. They are expensive and difficult to find ... If I lose one ... I'm out $30 and 10 minutes to get on line and order another ... not a huge deal.
Also I'm biased to this style of wheel. When I was 25 years old in the 80's and could find cheap used Cragars or any classic custom wheels ... I liked this style best .... stock black wheel, baby moons and beauty rings.
With the rings installed, they will be all chrome with a strip of black wheel showing.
And it is just what I like and want ... I have had the same wheels on several cars in the past.
For a truck some may like just the hubcap and no rings.