FX-1 How close is a SJ ride plate to fitting an fx1?

Im considering trying something new as far as a ride plate this summer assuming i ever rebuild my ski but im wondering what kinda options there are. It seems difficult to find a realy cheap fx1 plate but sj plates are way easier to come by. Would it be easy to make one fit??
If not anyone know where i can get a stock fx1 plate cheap?
 
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