Possible Speedway Silver Shadow Seat Pan?

Mini Bike & Go-Kart Parts

#1
I bought this seat pan over the weekend at an MC swap meet. The seller said it was an NOS pan for a Silver Shadow. Can someone positively confirm or deny this? I won’t use it on my intended MC project if so, and someone else needs it for what it is. Number underneath is 10722. Thanks.
 

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