Here's some feet that might work: http://www.resourcesforlife.com/docs/item3666
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'''UPDATE 7/19/17'''
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The feet are now available: http://www.ebay.com/itm/4pcs-set-New-for-Magic-Trackpad-A1339-Bottom-Rubber-Feet/111946042411?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649