Read thru the thread you linked and you’ll have your answer to both questions on safety and availability.

You want a cage? Like others have suggested, go talk to a road race shop, get some first hand knowledge.

Why do you think you need one? I don't have one in my car and it is due to one reason. It is a street car. If I get into an accident without a helmet there is a good chance I will crack my skull open without a helmet. No thanks. it is my opinion is you need a roll cage, you need a helmet and other safety gear to go along with it. Do what ya want. Some folks put it in there.

He should already have all the info he needs to start digging and think things through.

The problem is, he isn’t showing that he wants to think things through. He’s skip counting without learning all the numbers, and he hasn’t realized it yet.

Great question. Dr. Phil and an empty couch please report to exam room #1!

I have a 4 point bolt in from RPM. For me I feel its safe enough on the street, only a bit of the center section has any possibility of me hitting and its SFI then foam padded. At the time there was no good imo harness bar available, now I would have gotten the MA one. Just stay away from the autopower crap and ones with bolts on the cage itself. The chart i showed earlier is a very good tool but its not detailed for every situation. Any extinguisher (mounted not on the A piller) along with gloves and shoes would be a good investment. Also a mic/headset like a chatterbox is helpful to hear your instructor. Also before you get to the track have someone check your work last thing you want is to not pass tech.

I ran a RPM 4 point for many years and had it removed for a full cage because my Z will be a dedicated track other than hard parking it at car events. It is a quality roll bar. Next Level performance makes a similar one. At this point we seem to be preaching to the choir!:rofl2: