Try door mutes instead (below), you'll like them better than the adhesive foam rubber strips, they last a lot longer and won't gum up the plungers. The holes are already in the chime unit for them to be installed. I think they may have been eliminated from Gottlieb chime units as a cost cutting measure (time & materials). I like the grey version because they aren't as bouncy (dead rubber) as the black ones.
You should be able to locate the black type through just about any hardware store. The grey type can be bought through any construction place that sells pre-hung doors with metal frames.
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