Kohler Courage 22HP SV715 Carburator rivited to intake??

Not a mechanic, by process of elimination I have decided that my 7 year old Kohler Courage 22HP twin cyl SV715 carburetor needs rebuild. With some difficulty I have removed carb and intake manifold. It appears the carb is riveted between the air cleaner and intake manifold.



Are these rivets? I see no way to take this apart or put back together. Any suggestions. Thanks JIm