Skeeter,
To remove the caarburetor from the intake manifold, you have 2 choices. Disconnect the heat riser tubes between the intake manifold and the exhaust manifold and remove the carburetor and the intake manifold together or modify a 1/2" wrench to fit the lower nut. I wrote an article in Military Vehicles Magazine a while back on Mule tools that included some other modified wrenches to work on the mule. Go to the military vehicles website and search by vehicle and all of the issues containing mule aritcles will appear
Nick.