I found these to be a good substitute for replacing the Amiga 1000’s rubber feet under the chassis. They are slightly longer than the originals but can be trimmed a little (offcuts from 4 of these could be used in the 5th foot slot under the middle). On the positive they seem to have the right depth and indent to fit in the existing cutouts.
https://www.ebay.com.au/itm/156252685582If there are better suggestions out there, please share.