I was fortunate enough to receive a nearly new (but used!) ASI6200MM-Pro, 7x50mm filter wheel and M68 OAG. I had read a few things on here about the fit of certain filters with ZWO filter wheels so I thought I'd comment also in case others needed info.
I have 50mm unmounted Chroma LRGB and 49.7mm unmounted Astrodon Ha/OIII/SII filters. The Chroma filters fit in the slots just fine. There's plenty of room in the slots around the edge, but the retention rings hold the filters without a problem.
The Astrodons are a bit different. Basically, you need to make sure that the filters are well centered in the slot, otherwise the plastic retaining rings will slip over the edge along one side. It's very tricky to get the filters centered and stay centered as you tighten down the plastic retaining rings.
Although I think it would be fine like this, I wasn't 100% comfortable with it. Those are expensive filters to not be worried about if they might slip out somehow (not likely). So in order to help center the Astrodon filters and keep them in place I 3D printed some very thin rings/shims to go around the filters between the edge of the filter and the slot side. It's not as easy as it might sound. I printed the thinnest rings I could but I still had to sand the rings down so they were even thinner. Now, the filters have enough play to still be able to rotate but also stay firmly centered in the slot.