Not always the case, I used to have an S15 silvia which had some bucket seats I put in it. Laws are that if the seat is designed for the model of car and bolt in without modification they don't require certification but say for example you take a standard bucket seat and weld it onto the factory mount it would then require certification. The pricks at North city motors failed the WOF saying it required a certification, I printed out the laws regarding it along with the receipts that showed the seat was made for the model of car, I even got a signed message from VTNZ backing up that it was indeed legal but they refused to even look at it. Took it to VTNZ and got the WOF straight away. Never went back to the useless pricks, its one thing to get it wrong......its entirely another to be ignorant to the point where you won't even consider evidence that would suggest you're talking out your ass.
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