They're not quite as strict in NSW, AFAIK if you use existing runners its fine, as I have been thru rego and police stops with aftermarket race seats in cars, on factory runners, but I wouldn't have a commode seat in my car, I've driven a few and they feel like park benches. I've seen a few GQ's with a velour interior and I think they have lumbar etc so i'll try to source some from a wreckers.