Backstory: the search here sucks because the staff tried to update the forum software years ago, and everyone complained, so they reverted to ancient software with bad search.
You can however use Google, with a search like "site: project1999.com red x" (except no space between "site:" and "project1999" ... if I don't add a space, the forum makes it into a smiley).
However, I'll save you Gemini's bad summary of my writing, and just point you to what I think you want:
https://wiki.project1999.com/Template:Loc (ie. the wiki template I made that let's you create a your own locs).