I fixed the original mod by ondra014 which adds cat ears as replacements for Commoner's headband to support visibility when other players have it equipped. (seamless co-op) This does not mean it's safe to use in vanilla multiplayer.
Put the parts folder in the "mod" folder from ModEngine2.
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All credit goes to the original author of this mod - ondra014
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og mod author - ondra014
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TBH all I did to "fix" this mod was duplicate each replacement .dcx file and add the "_l" to the end of the file-ID. This way all entities that are meant to load at a lower LOD (_l.dcx files were meant to do this originally) will look the same as the original ones without the "_l" extension. This seems to just be an oversight by the OG-mod author because it's so simple but hey here it is!