The autotechnica ones are probably entry level. You'll notice they have a little red tag at the bottom or the side.
I'm told an engineer or blue slip guy will check for that tag which means its been certified.
A friend of mine just rego'd a full rally car with fixed back autotechnica seats in the last month.
Make sure you check the width. I bought the larger one by mistake and it was too wide for the Adub.
The rails will be the challenge. If you can get a "bride" kit to suit your car, it will make life heaps easier.
You'll fit your t top behind the seat as long as you don't back into it on the rails I reckon. If you're over 6 foot you might struggle there