What will fit

I have recently purchased a 1981 kz305 I need a new tank and a seat I am wondering what other bikes would have interchangeable seats and tanks if any. I was kind of hoping that the kz400 or kz250 would work as there were more of those made. Any assistance would be greatly appreciated

Thanks

I should have also asked about other parts in general are fork seals etc anything compatible with those other bikes

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