Bax, I need a replacement carburetor for a Magnum 52. I know an OS 4D and 40B carbs will work, but does the 40G from the OS 46AX have the screw holes in the same location? I know that the throat size is the same, but if the screw holes are in a different location, it won't tighten down with a good seal. Basically, are all of these carburetors interchangeable? And yes, I'm wanting the 40G because it costs less at Tower.