Tula-200.There is lot of different models of K-28 carburettor.If the K-28 has a cyrillic letter(Б,В,Г,Д,И,E,Ж, and so on) after K-28,that means that it is not for IZ-350.
K-28Б like the one on picture,is for IZ-49.It fits to IZ-350 too,but it is not original for it.K-28Д is for IZ-56,K-28Г is for Tula-200 and so on.They have different size main jets and other things are different too.
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