And to clarify further from what Dan said, a shoulder bar is in fact the bar that's at your shoulder in an open style cage. Obviously the point is to strength the junction points where the cage hoops connect to the shoulder bar. I honestly thought that mandating only plate type gussets was a little goofy and knowing that many cars have been using non-plate type gussets for many years I thought it only made sense to bring them in under the legal umbrella too and to use some common sense minimum specs. Maybe I'll re-propose my rule change again to include the omitted "saddle gussets".
Rocket123, it looks like you've already got a same-as-main-roll-cage-sized gusset between your A pillar bar and your "shoulder" bar. Instead of just worrying about what the tech inspectors want to see, why not think about where YOU'D put some gussets for additional strength and protection? Does your top "halo" hoop have an X in it? That's another form of gusseting. Do you down bars (from main hoop down to rear section of car) have an X in them? Does you main hoop (the one that goes over your head) have an X in it?
I hate to be critic without seeing more of your overall cage design but I don't know how you got through tech without at least someone mentioning your undersized gussets. It's not just a matter of meeting the letter of the rule (although you know you'll make it through tech every time if you do) but I doubt those 2x2 gussets are doing you any good. Honestly, as a tech inspector, I'd rather see someone do something that makes sense versus just putting something some where because the rule book says they have to. Just my opinion.
Don't forget to check out the last line of 3.A.3 while you're thinking about cage stuff.