This sounds like you have ; Dicor stainless steel simulators ; as you're already aware different chassis used different sizes of retainers and tools. The size on my Freightliner wouldn't help you
Dicor no longer supports these products , so finding the actual tools is frustrating to say the least . There are coated plyers for pulling the acorn caps and sockets for the retainers . But you'll have to measure what you have to be sure your getting the right stuff .
Actual lug nut size will be info to get from the chassis manufacturer.
What chassis is your Bounder built on ?
First picture is the Dicor logo on the cap center .
Second is the size of the retainer on my Freightliner chassis .
I'll see if I can track down a picture of the Dicor tools and any supplier.