Using calipers or a precision ruler, measure the dimensions of all the power supply chips.

Cut the thermal pad sheet according to the measurements and place the pieces on top of the chips.

Use 1-1.5 mm thermal pad thickness on grey chips.

Use 2-2,5 mm thermal pad thickness on the 8 flat chips.

Try to check the thickness of the original pads. If 2-2,5 mm thermal pads are too thick, you may need to use thinner pads.