How to ID 16" 8 bolt wheels?

[AuroraGirl]

I guess I need to confirm what the threads on my 1979 k20 4x4 suburban actually are: I assumed 9/16-18; those lug nuts I pictured above seem to be these SAE inner threads with the dual 'outside' threads being in a metric standard M27x 2.0; The center caps I bought are off a 2000 8 bolt ?Silverado? I was trying to see if that was the correct outside thread for those caps. Can't readily find this information online for some reason. Thank you AuroraGirl for also looking. Since I have the caps in hand, I guess I can match up those threads as well and hope the are the M27 x 2.0 so I can move on
Thank you, Pete

I wasnt clear enough, The plastic black nuts on the caps gmt800 and gmt400, are m27x2.0

If they werent for some reason you can buy new ones and pop them on (they come out), which would be that thread. Then yes you just need to confirm your 79 lug nut threads
Heres the 1979 service manual

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[bucket]

I guess I need to confirm what the threads on my 1979 k20 4x4 suburban actually are: I assumed 9/16-18; those lug nuts I pictured above seem to be these SAE inner threads with the dual 'outside' threads being in a metric standard M27x 2.0; The center caps I bought are off a 2000 8 bolt ?Silverado? I was trying to see if that was the correct outside thread for those caps. Can't readily find this information online for some reason. Thank you AuroraGirl for also looking. Since I have the caps in hand, I guess I can match up those threads as well and hope the are the M27 x 2.0 so I can move on
Thank you, Pete

Yeah, those should work just fine. Your studs are 9/16".

 

[bucket]

Well.... nobody wants them at the swap meets I've had em at in Texas. I had one dude who had the bigger ones on a lifted Blazer, but he didn't want to buy the whole set(and I didn't want to get stuck with two wheels I don't need). I don't want to sell them for scrap either, if someone could use them....

I'd love to buy them if I could afford it right now. But there's currently no budget for "want" items. There's really not even enough for the "need" items right now, lol.

 

[Catbox]

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These are fords right?

I ask because I can go shove a dog dish on each one(well I dont own the wheel at the end anymore) the front ones with the hole for the hub locker and the one with the GMC logo
I wonder if the 16.5 wheels had the same size ring , because Im pretty sure my caps are from my truck and my truck had 16.5 from factory.

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These were likely original to a square with 16.5 or my truck specifically (white, would be the original painted wheel color for my trucks color scheme)

Could be.
They look kinda like what came on my truck.
You would have to look them over to find the stamp to be sure though.