Check the FM Scout Downloads or SortitoutSI .
Since teamkits.rar is a generic filename, ensure you are downloading it from a reputable community source: Download File teamkits.rar
Once you have the .rar file, follow these steps to see the kits in your game: Check the FM Scout Downloads or SortitoutSI
Move the kits into your sider\content\kit-server directory. Download File teamkits.rar