Can I ask why you want a bolt in roll bar? I'm not trying to troll you, but you may need a different style roll bar or even a full cage depending on your goals.
I've bought a couple kits from Autopower for 24 Hours of LeMons projects and have experience with both their bolt-in and weld-in kits. We are actually in the process of putting in one of their kits into our 300ZXima LeMons car. In our case, Autopower doesn't make a kit for the Z31 2+2, but we called and gave them measurements and they sent us a kit that had plenty of extra bar to make work. Expect a little massaging if you are going this route.
A lot of people don't realize, but (and this is a good example of irony) roll cages can be dangerous in street cars. Imagine taking one of those bars and throwing a watermelon at it. That's what your head would be like if you hit it on one of those bars without a helmet. You can also break your arm extremely well across those bars. My point is that if you are looking for a bolt in kit for a toughness look, build it out of wrapping paper tubes.
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