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Buy a GM replacement boot. Not aftermarket or a or split boot.
They come from GM as a kit to include cir clip, boot,2 clamps & moly grease.
When ordering,you have to state if it's the outer/inner boot needed.
Outer boot is nearest the wheel/rotor, inner is next to differential.
You can order from the vendor here on the forum on the 4 sale section
Gene or patrickt @ GM Parts House.
You will have to pull the axle & do the repair on the work bench.
Good luck.