Isn't a b-pillar bar the same thing as a harness bar Dylan? Elaborate please.
Anyways, when Mitch and I were researching the harness bar idea in a Da9 we concluded that there are none on the market that will fit, and I highly doubt anyone will actually produce one. The reason behind this is because it would take custom fabrication along the b-pillar to make anything fit securely. You can't simply bolt a bar to the existing holes, because they are all too small. The rep from NRG that was talking to Mitch (Quick Spool Racing) suggested that you would have to drill and tap new bolt holes, however the metal in the B-Pillar is too thin to tap.
I think the only "safe" way to do it would to be weld a support onto the B-Pillar that has nuts welded onto the backside. Maybe a "sandwich" plate kind of setup. It wouldn't be easy, but it's about all you can do. If you actually do make custom plates to set up on your b-pillar, NRG makes a harness bar that is very close to the measurements needed. The difference could be made up by the mounting plates.
So my guess is that the "b pillar bar" or "harness bar" in the picture would be very unsafe and not actually pass a tech inspection.