No the side bars ( nascar stylr) are not legal the side bar must pass mid way between the sholder and the elbow of the driver in a seated position. you have to ues 1.75 (for a roll bar)x MINIMUM .118 wall material. most guys if using ERW tubing use .134 wall cuz the wall thickness is so inconsistant. if your doing a cage then you would use 1 5/8 material DOM tubing you can get away with .120 wall material it's more expensive but better quality.
the design of the cage changes if more than 3? square feet of the original floor or fire wall is removed, then you need a dash bar and i think rocker bars? just going from memory.
gotta have 1/8 6x6 pads welded to the floor pan at each mounting location or one 6x6 on both sided of the floor pan boltet through the floor with 4 3/8 bolts ( this option sucks)
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