Replacement carb WR400?

I have read a few threads here and there about people replacing there old gen1 carb with one from a newer 450. I just wanted to know for sure what year, model, size I should get to upgrade my old tired leaky carb. Is there any in the aftermarket that do not cost a small fortune or should I just go with a later model 450 carb? I appreciate any help before I drop any money on something that may not work. tia

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