Pretty standard NO (Normally Open) SPST (Single Pole Single Throw)
microswitch. The only extra bit is the piece of plastic shown in the
photo. If the OP's plastic is fine then he only needs the switch. Hunt
around! Do get one that has regular electrical standards such as cUL for
safeties sake! Don't get a cheap one from China, unless you want a bit
more electrical fire/shock risk in your life.
Some switches do use gold contacts - if the switch is under 1A chances
are the contacts are gold flash (perhaps $0.01 worth of gold).
John :-#)#
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