I would think the suspension parts are there, but expensive and it's the only thing missing for the BE/BH Legacy.
I got a set of Tein NA kit for my BE legacy directly from Japan.
I got the whole set for about $1100 delivered. Quality is good, but I wasn't too happy about the stiff spring rate. Even with the soft spring I have, I still have to use 13 clicks from soft @ front and 15 clicks from soft for rear. I can't imagine what will happen w/ the mid spring that suppose come w/ the kit.
The rest of the upgrade stuff should be pretty easy to locate.