Seat legality

Hello all.
We'd like to clear up some issues regarding the seat on our Goblin car.
It's an older kit which came with a purple moulded school-chair type seat.
This is the standard seat which cane with the kit however not the same as the one in the shop.
Are these still legal, or would we have to buy the vacuum formed one?
I know it seems like a silly question but wouldn't want to get to a race to be told we couldn't race.
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