Dog Dish Caps for K10 6 Lug Wheels

[Pekoe1111]

I have a 1972 K10. I understand that 1/2 ton caps are smaller (10” or 10.5”?) than 3/4 ton (12”).

Am I correct that all K20 3/4 ton wheels are 8 lug?

I am looking at getting the rare 6 lug 15x8 steelies and want to make sure I’m getting the right caps.

My confusion is that there appear to be two style 1/2 ton caps.

I have the flatter ones on the bottom.