here are some pictures of the bars mentioned
other features of early thirty cars
many have no dimples in the front fender where it goes over the front frame horns
the front cross member dosnt have a hole for the radiator drain
many have the 7 tooth steering column with the splined steering wheel
some of the coupe type cars dont have a bead all the way across the rea panel under the trunk?rumble lid it sops at the rear tire mount
the deflector on the bottom of the windshield is clipped like the 29s,not double notched,electric windshield wiper
the U shaped early 30 cross brace looks like someone manually cut the bottom edge with a hacksaw
all the ones ive seen are like this
the round one with the notch cut in the edge was to clear a rivet on the arm standoff ,like Marco stated,
I have a November 29 engine in my Briggs sport coupe,so I assume it was made in Dec 1929
I have the short cowl band ,it has the early fenders with the smooth fronts on the fenders ,(no dimples,no eyebrows) 7 tooth steering column with splined wheel, the unique rear bumper cross brace
I dont understand how Briggs made cabriolets with long cowl bands and eyebrow fenders and at the same time made sports coupes with different fenders and cowls
Briggs stamped the cowls