You guys in the parts world with request for information should give real part numbers in the tech manuals. You would get a much broader range of information from other members.
No one wants to have to dig up tech manuals they don't have, look up referenced symbols, fetch part number and/or NSN, just to get started to try to help you out.
Once part number is given, no one really need know t he application, end item, or any other information. From there, they can give you the infor you want like cross referenced part number, suitable sub, perhaps a beefier replacement part, source of supply, etc.
No one looks up a part by Z4 or Q2 unless they are the end user. So try to help out those trying to help you and give them the real part number from out of the Tech manuals and cut that end of their research off for them.