Lvl3 Golem Models 28-9

This seems to look like a texture pack for you, not an Add-on, though it includes behavior files and actually needed to get things right:
Iron Golem became a little bit slower to match its new walking animation,
Their scale or size were fixed, without the behavior, the Snow Golem is twice taller than the Iron Golem,
And also their collision box for their new models.