I would replace them if they were to get contaminated with grease / shock oil etc or if they were to be damaged when assembling the slipper, i.e you dont get them located correctly and tighten it up without noticing. You really should try not to get grease near the pads. When putting the slipper together, I'd turn the car on it's side and make gravity work in my favour rather than against me by having the car on it's wheels. The slipper will go together easy enough. And ultimately it will wear.
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