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To check for binoviewer compatibility, add 17 to 18mm to the diameter of the eyepiece (you might need to look it up). If that is smaller than your interpupillary distance, they are fine for you.
If that figure is larger than your IPD, then you and the eyepieces are not compatible.
One additional check--the longer the eye relief, the larger the eyepiece you can use because your nose need not be completely in between the eyepieces. It's a sliding scale, and it might take a bit of experience to know how large an eyepiece you can get away with.
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