It requires drilling on the 3rd foot. The first 2 you will use the 3rd row mounting points. I havent drilled the 3rd foot at as its already sturdy on my 33 wheels.
Finally got my interior tire carrier from BellFabrications. I was on the fence if I wanted swingouts but for now I want to travel light so I opted for an interior tire carrier. I've searched everywhere but most were discontinued until I saw BellFab's on Toyota 80 Series FB page.