I have this style. http://www.revolutionracegear.com.au/?PCID=10548&PSO=245&PSID=3100076004&PSV=Primary&CDO=
My side intrusion bars are almost identical to yours. I'm not 100% on the positioning, I just positioned mine as far forward as practical. It's not level with the wheel, but goes from the back of the window opening forward.
The push button thing is an option, the normal spring ones just need the handle to be marked red or something so they can be seen.