I know they fit the Stiner and Fujinon 7X50 M22's, I have both and they go on and aren't in any danger of coming off. All m22s are armored like most military/naval style binos that's probably the big difference in objective end size here.

The swfa ss 10x42 is found under Tasco brand

Use ranger bands.

7x50 doesn't refer to the lens size. 7x50 is the function. Wherein 7x is your magnification and 50 is your FOV