How to ID 16" 8 bolt wheels?

[hypercycle]

Hello,

I have a '79 k20 Suburban that had OEM 16.5 x 9.5 tires & rims.

Long story short: was provided with 4x 16" 8 bolt rims that fit the truck fine with correct appearing hub bore fit.

But OEM hubcaps don't fit these 16" rims. I had assumed that was merely some difference between the gm 16.5 and 16" gm rims.

I want to find hub caps that fit these 16" wheels.

Now recently NOT having a 16" spare and my last 16.5 tire approaching 25 yrs old, I went to salvage yard and found a nice 8 bolt 16" wheel off an older chevy van to be my new 16" spare.

I get it home and for giggles, I try the old 16.5" oem hubcaps: they fit like a glove !

So what in the heck are the four 16" wheels I am currently running on the truck where th oem gm hubcaps don't fit?

Old dodge or ford rims with the same hub bore? Or some different oem GM wheel. How can i tell and more importantly WHAT hub caps will fit them wheels?

The truck looks ok without the caps but seems somewhat 'naked' appearing. I'd like to have some no brand or chevy caps to cover up the bolts.

I've spent hours online to ID what 16" wheels I have, & find a solution, but NOT having much luck.

WHAT rims are on the truck and what trim/center cap or oem caps would work with them.

THANKS

PHOTOS:
16" up front; and OEM 16.5's in front with caps and 16" in back(old photo)

 

[Catbox]

My truck came to us wearing a set of Ford wheels.
There is a Ford stamp on each of them proclaiming so.

I can see yours have some stamps on them, is there a makers mark on the front or the back?

 

[mcarlo86]

Those wheels kind of look like GMT400 wheels. They never had hubcap rings like the older squarebody wheels. They came with plastic center caps.