Oh I should have specified. Yes the previous owner installed these sometime before I acquired the bike. They are a mystery to me as I cannot find markings anywhere. I've cleaned them up and inspected them closely, but had no luck finding a model number or brand. They have since been installed back on the bike (which was a very tight fit, because once mounted on their bracket, they are slightly too narrow for the intake boots on the cylinders). I was hoping to find some carburetor aficionado to identify them by sight, but any information is greatly appreciated.