Technical 15x6 wheel 5 on 5.5

Ok, I'm guessing that it's just a F100 wheel, but I have 3 which are the same & a 4th with subtle differences, the center looks earlier than the others. They are all 5 on 5.5 pattern & 6" wide. Thoughts? the odd one looked like one advertised as 50 Merc??
TIA

 

50 Merc hubcaps are bigger diameter. Off the top of my head I don’t know what that is though. To my eyeballs, that one doesn’t look like a Merc.

 

I'm selling the wheels & didn't want to miss something, the shape of the rim is a slightly different shape also.

 

I would think the 4 nub wheel came later.

Are the centers welded or riveted

 

just paint them all the same color and either run wheel covers or no caps at all. at a glance they all look the same.

 

Wish I owned them

 

More than likely merc if a regular dog dish (non merc cap) is too small
Won’t matter if running full caps.

 

They are welded

What's the difference in size between the two?

 

Not sure. I have some merc caps I can measure when I get home

 

Looks to me like pick up truck wheels

 

Most likely 67 & up pickup wheels.

 

Merc cap

ford cap in a Merc cap

 

Didn't Dodge also use 15x5.5? I seem to recall mounting Dodge Ramcharger wheels on one of my F150's, but it's been 30 years or so.

 

Yep.
I think the dodge center hole was smaller