Your holders are bigger width wise correct. I had that same problem and they fit perfectly in their new boxes. If you have the extra thick one like for high relief coins then you will have to break out the slots in the box to make a wider space.
They are the cardboard boxes that NGC uses for shipping their registered mail. The dividers are fiberboard and slide into slots. I have dozens of them in my storage unit. Chris
Do you have a NGC plastic box(20) not a PCGS box? I was able to fit mine right in the newer silver box.
The slab is bigger than the box. We're talking about the oversize holder here. It's huge. The only cases I've seen for them hold only one or two slabs.
Ok I see now what you are talking about. I have several of those coins that are ungraded including the 2 OZ. and they are very large in diameter. From the research that I have done I couldn't find anything.
These cases look nice, but it's $40 per slab for this storage. I'd rather have something cheaper like a giant version of the NGC 20 slot plastic case. http://www.wizardcoinsupply.com/aluminum-slab-case-1-large-ngc-slab.html http://www.wizardcoinsupply.com/aluminum-slab-case-2-large-ngc-slabs.html