Agree with most of above, but also add that rego requirements can come into it... here in Qld apparently seats have to slide if they did originally, dunno what it would be in SA.
With seats in general for rego there's a requirement that both seat and mounts meets ADR, and if it's a dedicated race seat could be issues there... most engineers won't sign off on it unless it's marked as ADR compliant, or you have a test report to say that it meets the spec.... just being FIA spec doesn't mean squat for rego.
Finally race gear needs to be in date too, and at events good/thorough scrutineers will check for that on seats and harnesses. For FIA spec gear they recently increased the life to 10 years from manufacture - it used to be 5 - basically a seat that's past expiry is worthless.
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