I recently acquired an iMac G3 (Snow) and I'm planning to fix it up/clean it up for a friend as a gift. It is my understanding that Apple used thermal pads instead of paste on the G3's and that I should replace it with new. I have two questions: 1) How many/what parts have thermal pads? (I haven't torn it open to see, I only want to take it apart and put it back together once.) 2) What is the thickness of the pads? There are several thicknesses available but I have no idea which one I should get. Thanks for any input!