"To ensure that aircraft perform reliably the FAA requires that alll installed parts and appliances conform to technical standard orders (TSOs). TSOs are a set of specifications that call for parts to meet certain quality standards. A TSO stamp on a part means that the part meets FAA requirements for manufacturing quality, and is approved for installation on aircraft." Straight from the Jepp manual I used in A&P school. Also look for a PMA stamp. That means IIRC that it is approved as a replacement part.
Your safest bet would be to get a hold of the aircraft IPC, if available, and put in what it calls for.
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