Hello, i'm having a problem with a item I bought off of ebay a few months ago. I bought a display case like this one (Link Here) and noticed that the Sacagawea dollar direct fit air tites is to small & the ones with the ring is to big. The direct fit for the Kennedy halfs fit just right but I need a ring that will fit inside the air tite that would hold the sacagawea dollars. Any help would be appreciated