What's required seems to differ from engineer to engineer from talking to them. When I wanted to get my pod done, one told me it was ok, another told me it would be fine so long as it had a serial number on it (??). Anyway in the process of looking for one too, as I think the money outlaid would be better than fines for a defect - plus I'm sure it would make my insurance company happier if all the mods are registered with the RTA..