The booster you describe is NOT an annular booster. I think it's called a LOG type.
I have changed them out of an older 8082 Dominator.
I have a newer 8896 whitch means 3 circuit (intermediate), I am sure it has annular boosters. I will post pics later tonite or tomorrow.
The 9375 IIRC is dual quad carb, and it has a leaner calibration. I will look in my catalog for the descriptions. Don