I would go with a 6 point as stated earlier. You can always add a few points (pain yes, but possible). But a six point will get you what your looking for. I have one in a T-type I have and had the shop that installed it keep the side bars as low as they possibly could and still be safe (and legal). I didn't want a swing out bar because of rattles and for sake of being more rigid. Keep the bars going into the trunk as high as you can to allow as much access to the back seat as possible. I don't know what kits are on the market, but I would look at getting what you want done for your needs. Any good chassis guy/shop ought to be able to accommodate you. Also (its been a while) but chrome moly tubing will allow you to go with smaller diameter bars than mild steel if memory serves.

Scott