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An easy replacement for feet is a dab of hot glue. Just put it on where the foot was and you'll be golden.
 
Yup, they're pretty cheap on eBay. So far I've been lucky with both 12" iBook G4 and 12" Powerbook G4 having all original feet still present and intact.

Unfortunately, looks like someone has picked at the rubber domes on the display bezel of the iBook G4. I would imagine replacements for those are harder to find.
 
You can always use Sugru to make your own, it's perfect for things like that or the domes on the display bezel.

You can literally fix almost anything with this stuff. It's on eBay too but here is the manufacturer's website with info on what it is and what you can do with it.

http://sugru.com/
 
You can always use Sugru to make your own, it's perfect for things like that or the domes on the display bezel.

You can literally fix almost anything with this stuff. It's on eBay too but here is the manufacturer's website with info on what it is and what you can do with it.

http://sugru.com/

A good nickname for that stuff would be "Magic poop" :p
 
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