I don't think those work without the older strut tops Tyson.
And it's not just the extra weight of the wagon body over the sedan body. It's the extra weight you may or may not carry inside the wagon compared to what you fit into a sedan.
Anyways, yes you can bolt STi springs into your wagon and drive around perfectly happy. It's just not as good for your struts as
proper springs would be. If you buy coilovers with threaded strut bodies, then it doesn;t matter as you should be able to get correct adjustments to it.