look down to the bottom of the page. These are Hot Seat manifolds that run the carbs sideways aka seadoo setup. but you can make or search for adapter plates to rotate and clock them 90 degrees.
Yamanube- He is referring to the adapter plates found in various places. aka Watcon, Rhaas, Or on Ebay- They bolt to the oem Polaris intake and have studs for mikunis. FWIW they do work. and there is pleanty of meat on the oem intake to support the weight. you can open up the intake runners slightly but they get thin..