you will need a bit of extra length in the y pipe and t/b coupler, might be able to extend your current y pipe after the 90 degree bit that attaches to the turbo

yes you will need the gd bov also as the flange where they bolt onto the tmic is different

you will also need to do a bit of creative cutting and shutting of the bov return hose as its in a different spot on the gd bov

so in your wanted add i would suggest you ask for:
gd wrx tmic
gd wrx bov (inc return hose elbow)
gd tmic drivers side bracket

this should be anough to get you started, the rest of the stuff you have should be able to be modded to fit