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Is it safe to assume that the hole at the upper right is for the Heater Motor Wires? I would guess they go through a grommet to keep the weather out?
A hole was cut into the kick panel to accommodate the flexible hose to the heater?
Dan , you really do not need to make the hole for the wires the size of the knockout hole . Get he smallest grommet that will let you get the wires thru. The grommet package will tell you the O.D & I .D .Drill the hole accordingly . A uni bit work s well . Good luck