Category view (lastpost.tpl) get user's group colour?

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I've been playing around with a new template and when view posts on a topic, I've managed to get it to colour the user's name with the same colour as the selected group as per their profile.

Do you know how I can do this with the lastpost.tpl on category view? I've tried to do it the same way as I do with the post view, however when I look for the selectedGroup/selectedGroups array, I can't find it.

Thanks in advance.