Here's my 2017-18 Liiga pack. It includes jerseys, helmets, goalie helmets, team logos, league logo and playoffs logo.
Liiga 2017-18 for FHM4
To install in your current game, extract to your \saved_games\your saved game name.lg\graphics folder.
You can also extract it to your \quickstart_games\OpeningDay.quick\graphics folder so that it will be used every time you start a new game.