But joint on roll cage?

I'm building a full cage, 12 point.
Yes, I have the 2016 NHRA book and have read it. It's just hard to understand some of their wording.

Looks like I will just remake that bar. The one I made was a little short.
Thanks for the advice.
My car is certified to 7.50 with 2 bars butt welded with internal sleeves . You need 2 rosetts top and bottom on both sides of the butt weld