Not many people reply cause a lot of questions have been asked before..
You'd see using the 'Search' bar.
Not sure how different the wagons are..
Front shocks: recommend U13 bluebird coilovers
Rear shocks: U13 Coil over sleeve kit (slight mod needed to struts)
Look into swaybars, if they're the same Aaron might still have his U12 Whitelines. Get them.
Front S13 strut brace, elgonate one of the wholes to fit.
Rear strut brace, Cusco brace you should be able to easily find the link to buy them here somewhere.
Brakes; Pretty sure Pedro was selling a bigger Master cylinder or booster or somthing, and 32 skyline 4 pots (i think they're 4 pots) almost bolt up. Failing that, U13 brakes have a bigger caliper and a 280mm disc and bolt straight on. Depends on how hard you wanna stop.
EBC brake pads.
Nolithane bushes ect
I'm not sure about U12 to wagon compatability, but should give you a rough idea. Maybe some 31 skyline gear will be closer