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...as already stated above, Suntour Accushift was unique. And not always in a good way.
If you can live without indexing, you can probably get it up and running cheaply by just buying a 7 speed Sunrace freewheel off Amazon. Then either set your shifters to friction (if that is an option...I've not worked on your particular version) or replacing your shifters with some friction ones, also made by a bunch of companies like Sunrace, and also sold on Amazon, or wherever you buy used parts.
I have no idea if you have DT shifters, barends, on the bar thumbies, or something else. But these are all available used. They are left over from the stone age, before indexing, when life was good and I was young.
